Patch 3.2.0/API changes

Development Tools

 * The default UI now contains versions of some popular (I may be biassed) tools for UI developers - /dump, /eventtrace, /framestack, and /reload

Saved Instances

 * updated -- added two bools to return: instanceIDMostSig, isRaid
 * updated -- Added Bool isPreviousInstance to return (part of the extend instance stuff)

Functions

 * removed -- Replaced by GetQuestDifficultyColor(level)
 * new -- exact replacement for GetDifficutlyColor(level)

Arrays
Not sure of where these arrays live (global? FrameUI? QuestUI?), but this very subtle change broke several addons, so it's being included here
 * removed "QuestDifficultyColor" array -- Replaced by "QuestDifficultyColors" array
 * new "QuestDifficultyColors"array -- exact replacement for "QuestDifficultyColor" array

Unit Functions

 * updated or removed -- (not 100% sure, but believed to have been removed)

Quest Maps
There's support for points of interest on the map associated with quests, the API functions are:
 * new -- Is 'index' the normal quest log index?
 * new
 * new

Quest API

 * undocumented
 * undocumented
 * undocumented

Casting Events
Spell casting events and queries indicate whether enemy spells/channeling can be interrupted:
 * new
 * new

Casting Functions

 * updated -- added interrupt result
 * updated -- added interrupt result

Calendar Functions

 * updated
 * new

Mail functions

 * updated -- added totalItems

Gamemaster Functions

 * new

Loot Trading/Refunding

 * new -- triggered when a returnable item's refund period ends (or maybe would end if action performed?)
 * new -- Not 100% sure of this is the right event name
 * new -- inferred from staticPopupDialogs.lua
 * new

Other Information

 * new - Returns basic information about another player from their GUID
 * new
 * new
 * new
 * updated -- updated to work properly in dalaran (returning 1 in Karsus landing)

Combatlog Events

 * updated

ChatLog Events

 * new

Inventory Events

 * new

Unit Events

 * new

GameMaster Events

 * new

Battlefield Events

 * new
 * new
 * new
 * new
 * new
 * new

Reputation Events

 * new
 * new