Release Notes:

Fixed an issue where secondary sound effects would not work with the Use Hardware option enabled in the Sound options of the User Interface.
Fixed an issue where attempting to use some instant cast spells with Auto-Dismount in Flight checked in the interface would fail.
Items that have multiple charges will now properly display the amount of charges.
Fixed an issue where chain damage spells were chaining to critters.
Female Draenei horns will now correctly protrude through certain plate helms.
The Vengeful Gladiator’s Rifle will now play the proper sound when used.
The Cursed Vision of Sargeras now gives the buff, “Sense Demons” which can be canceled normally. Additionally hunters and druids are able to track two things at once while using the item.

2.4.2 Patch