Patch 2.3.0 (undocumented changes)

General

 * New hippogryph Flying Mount added, the Cenarion War Hippogryph. Costs (before faction discount) and requires  with Cenarion Expedition.
 * New neutral flightpath in the Hatchet Hills in Ghostlands, just outside Zul'Aman. It's name says "Zul'Aman" instead of Hatchet Hills at the flight master interface. The flight path is connected to Light's Hope Chapel in Eastern Plaguelands (both sides) and Tranquillien in Ghostlands (Horde only); the flight master over there is Kiz Coilspanner.
 * It goes without saying that with the addition of this new flight path, flights from Quel'Thalas to Lordaeron and beyond are now possible, making the game flow a bit smoother.
 * The font used to display numerics on UI bars has changed from Arial Narrow (as in chat boxes) to Friz Quadrata TT (as in user and guild names).
 * Drinking system messages have been expanded to include what a person getting drunk is drinking. (Example: "Thatoneguy seems a little tipsy from the Rhapsody Malt.")
 * Tracking abilities such as Track Humanoids now distinguish allies and hostile targets.
 * Guild Information panel now features a 'Log' button, which shows invites, removals, promotions and demotions. Number of log lines it retains is unknown at this time.
 * Griftah has moved back into Shattrath, now with a quest for Zul'Aman.
 * Pitch Up and Pitch Down keybindings have been added back into the game. There is no longer a pitch limit, allowing you to use these keybindings to do flips on flying mounts.
 * Killing some (but not all) members of the Syndicate now gives Ravenholdt reputation, and decreases Syndicate faction (previously killing Syndicate NPCs did not lower this faction's reputation).
 * Bodies will now fall to the ground when killed in mid air, continuing their previous momentum. Players cannot release their spirits until the body has landed.
 * Cro Threadstrong now shouts more phrases at Granny Smith.
 * Fiora Longears has been moved from Theramore Isle to Auberdine.
 * The packs of felhounds have been removed from Demon Fall Canyon.
 * William Dunadaire, Sulan Dunadaire, Benjari Edune, Becanna Edune, Elenna Edune, Aleanna Edune and Goodie added in Ashenvale.

PvP

 * There are a few new pvp oriented trinkets for 2.3. All versions of the trinket have a click effect to gain 1750 max health (kind of like the old lifegiving gem effect), along with a passive effect (your choice of 47 spell damage, 40 spell crit rating, 80 attack power, 40 melee crit rating, or 88 healing).

Arenas

 * New Arena System: Personal Ratings
 * The Personal Rating will be unique for each team the character belongs to.
 * It will rise and fall using the same formula as the Team Ratings.
 * It will only be affected by the games that the player plays in, not all team games.
 * Eligibility for end of season rewards will be determined by the Personal Rating, which must be within 100 of the team's rating.
 * It can't be padded by joining a new team. The Personal Rating will reset for the bracket when a new team is joined.
 * Season Three - Season Three gear will require a certain amount of arena rating points. Furthermore, the rating requirement is based on a new personal arena rating that is independent for each member on a team.
 * Weapon Rating - 1850
 * Shoulder Rating - 2000

Battlegrounds

 * New Battleground rewards: Boots, Belt, and Bracers
 * Season 1 arena rewards will be available from the battleground honor vendors once arena season 3 commences.
 * Capturing a mine in Alterac Valley now will give to your side 1 reinforcement per 45 seconds. If your team control both mines you will get 2 reinforcements per 45 seconds.

Priests

 * Prayer of Mending can no longer be reapplied if the target already has it.

Hunters

 * Untalented firing range of 5-35 yards, eliminating the deadzone.
 * It is no longer possible to keep 2 targets frozen at the same time.
 * Viper Sting (hunter ability) can no longer be applied to enemies who don't use mana.
 * It is no longer possible to Feign Death to leave combat during raid boss encounters, it still wipes aggro to avoid death. Feign Death still works as before on Non-boss mobs.

Mage

 * Ice Block no longer stops character from falling. i.e. You will continue falling after you have activated it, and will absorb any fall damage if you land while in the block.

Warlock

 * Spellstone has had its use text fixed and now properly says that it dispels instead of removes magical effects.
 * Soulstone animation now appears on the target of the stone and not the casting warlock.
 * "Aura" animation on targets of Siphon Life.
 * New animation associated with the use of soulstone effect after death.
 * Warlock quest "The Prison's Binding" changed from 60 to 70.
 * Warlock quest "The Prison's Casing" changed from 60 to 70.
 * Warlock quest "Suppression" (final quest in Doomguard chain) changed from 60 to 70.

Warrior

 * Night elf and Tauren ears and horns are now visible while wearing Tier 4 and Tier 5.

Pets

 * Hunter and warlock pets will no longer fall to Twisting Nether and die while entering areas in Shadowmoon Valley that cause your flying mount to transform into the Dragonmaw Netherdrake.
 * Since players need 20% less experience to get from 20 to 60 level pets also need 20% less experience to ding at these levels.

Alchemy

 * The categories in the profession UI changed. Previously the category for potions, elixirs and flasks was "Consumables" and most transmutes were in the "Transmute" category. After 2.3.0, the categories are now "Elixir," "Flask," "Other" (where Cauldrons and consumable oils such as Frost Oil are placed), "Potions," "Meta" (for the Transmute: Earthstorm Diamond and Transmute: Skyfire Diamond recipes), "Elemental" (for the Primal and Essence transmutes), "Herb" (for the Philosopher's Stone), "Metal & Stone," "Other" (yes, a second Other category, this time for the Alchemist Stone, Mercurial Stone, Ghost Dye, and the crafting oils such as Fire Oil), and "Parts" (for Goblin Rocket Fuel). The "Quest" category, containing Gurubashi Mojo Madness, is unchanged.

Blacksmithing

 * Various crafting categories have been created/rearranged to include recipes in different categories. For example, Iron Counterweight was under the category "Trade Goods" before Patch 2.3, now it can be found under "Item Enhancement".  This recategorization seems somewhat inconsistent, as at least one of the grinding stones are in one category ("Other") while various grinding stones are in a separate new category "Metal & Stone".  At present, it is unclear what the reasoning was for creating the new smithing categories or the assignment of Blacksmithing recipes therein.

Cooking

 * A new recipe for Skullfish Soup will allow cooks to create a mana regenerative consumable with a ‘well-fed’ buff that requires one of the new types of fish found near Karazhan and Zul’Aman.
 * The category in the profession UI changed. Previously all recipes were in the "Consumable" category. Now the category is labeled "Food & Drink," except for Broiled Bloodfin which is in the "Meat" category (which seems like a bug).

Engineering

 * Fel Iron Musket no longer requires Thorium Tube x2 to manufacture.  The ingredient has been changed to Heavy Stock.
 * Non-combat pets (like the ) have been moved to a new "Pet" category.

Leatherworking

 * Greatly reduced mats needed to craft all drums (no longer need primals, only different kinds of common leather) and drums have been upgraded from 30 charges to 50.
 * New +10 stamina armor patches can be learned from leatherworking trainer. Requires 350 skill to craft.
 * Rebalanced skill requirements to craft all drums.
 * Due to various changes to drums skill requirements, new armor patches, gloves reinforcements and new quivers, it is possible to reach 375 Leatherwoking skill by crafting only blue items.

Fishing

 * GetItemInfo now returns "Fishing Poles" instead of "Fishing Pole" for the itemSubType for all fishing poles.

Quests

 * Lord Illidan Stormrage &mdash; The trip from Netherwing Ledge to Shattrath on Yarzil's back is much faster now.
 * The quest chain beginning with Ursius of the Shardtooth in Everlook can now be picked up by both factions, because the NPC Storm Shadowhoof is no longer hostile to the Alliance.
 * The Winterspring quest chain started by Donova Snowden now culminates in a blue trinket, either Strength of the High Chief (+50 attack power), or Power of the High Chief (Increases damage and healing done by magical spells and effects by up to 29).
 * In Blackrock Depths, you no longer bash the beer barrels in order to get Hurley Blackbreath to show up. Instead, you "open" them.
 * Reputation gains from the quests related to the Wintersaber Trainers faction have been increased.
 * The Custodian of Time that shows you around the Caverns of Time now walks much faster. The new walk speed is slightly slower than running backward.
 * Zuluhed the Whacked and Arcubus Destroyer are now hostile to all players, regardless of Netherwing reputation level.
 * Diathorus the Seeker has been moved closer to the entrance of the barrow den, in Demon Fall Ridge.
 * The waves of harpies have been removed from starting Test of Endurance. Grenka Bloodscreech is summoned after breaking one box.

Serpentshrine Cavern

 * The Circular platform in The Lurker Below encounter was a bit changed. There are now small ramps on its borders, making it easier to get back onto it. The platform where the ranged adds appear remains unchanged.
 * Whirlwind animation for Leotheras the Blind was fixed and no longer looks insanely buggy.

The Mechanar

 * Mobs no longer reset after moving down the elevator. They can get lodged in the wall or stand at the top, making them very hard to kill and almost always impossible to loot. See this conversation with a GM for more information.

Items

 * will also be available off Karazhan and Zul'Aman bosses. You will be rewarded 1-3 per boss.
 * and now stack in lots of 20, up from 10. The sound the runes make has also changed.
 * Depleted Crystal Focus now stack up to 20 (previously, stack size was 1.)
 * Witching Band (the epic drop from the Headless Horseman event) has been changed to Witches Band.
 * Mote of Life can now be placed in Herb Bags.
 * All Motes and Primals (Including Primal Might and Primal Nether) can be placed in Enchanting Bags.
 * Motes and Primals of Fire, and Earth can be placed in Engineering Bags and Mining Bags.
 * Toolboxes can hold ALL Motes and Primals.
 * Essence of X items such as Essence of Undeath and Essence of Water can now be placed in Enchanting Bags.
 * Ichor of Undeath can also be placed in Enchanting Bags.
 * Field Repair Bot 74A will now stack up to 5.
 * Snowmaster 9000 can now be used while sitting. This also means it can be used while eating or drinking.

World Environment

 * Boats and Zeppelins that carry players are now populated with NPC crews, some of which are vendors. The boats also now rock side-to-side while moving.
 * The aforementioned crews were unfortunately removed some time after Patch 2.3.0 and before 2.3.2.
 * The boat between Teldrassil and Darkshore, and the one between the Forgotten Coast and Feathermoon Stronghold now use the night elf ship model, rather than the human ship model.
 * The travel time of boats and zeppelins appears to have been shortened, meaning shorter flights.
 * All Netherdrake mounts will now leave a trail of energy behind them while traveling.
 * Inn in Sanctum of the Sun (Scryer outpost in Shadowmoon Valley) is no longer flagged as an inn area. There is still an innkeeper, but you no longer get the rested bonus.
 * Fishing difficulty for Skysong Lake in Nagrand has increased. Prior to 2.3.0, fishing skill of 475 was adequate to always be successful. Post 2.3.0 they will escape occasionally at the same level.
 * Bloodvenom Post in Felwood now has a path leading to it directly from the nearby road. Some environmental objects that were previously obstructing the path have been removed.
 * Warden Iolol renamed Warden Moi'bff Jill.
 * Wretched npc's got a new look.
 * Thrall now sits on his throne.

Item Drop Rate

 * Due to the lowering of mob levels in level 1-60 instances, items that were previously available from most mobs in the instance can now only be found on bosses.
 * Most notable items affected are the sought after twink weapons, Shadowfang and Assassin's Blade from SFK and Pendulum of Doom from Uldaman.
 * The item level of the items has not been changed but the mob levels have.
 * Blizzard has not commented on this and it is unsure whether this was purposeful or unintended.

Sound
/console Sound_ListenerAtCharacter 0 or add this to the WTF/Config.wtf SET Sound_ListenerAtCharacter "0"
 * Human and Dwarven inns have new music added.
 * Karazhan has 14 new soundtracks for different parts of the dungeon.
 * New music has been added to the Temple of the Moon in Darnassus.
 * Many miscellaneous sounds have been added to creatures throughout the game, including Mounts.
 * The option for "Sound at Character" has been removed from the interface. All sound is now at the character by default,
 * According to a BLUE forum post, the following commands disable sound at character: