Patch 5.0.4(2012-08-28): Cooldown reduced to 12 seconds (down from 15 sec). Magic school lockout duration increased to 3 seconds (up from 2 sec).
Patch 4.3.0(2011-11-29): Wind Shear's base cooldown has been adjusted to 15 seconds, up from 6 seconds. The Elemental talent [Reverberation] now reduces this cooldown by 5/10 seconds, up from 0.5/1 second.
Hotfix (2011-04-29):Some interrupts were still incorrectly missing targets. Wind Shear, Spell Lock, Counterspell, Mind Freeze, and hunter pet abilities Nether Shock and Serenity Dust should no longer miss.