The latest patch notes can always be found at http://www.worldofwarcraft.com/patchnotes/

Bug Fixes

• Clients utilizing OpenGL video modes will no longer experience graphical anomalies and missing textures after minimizing/maximizing the window.
• Fixed an issue that caused Fel Eye Stalks during the Legion Ring event to not despawn when the event is completed.
• Fixed an issue where zoning after mounting and summoning a pet was disconnecting players.
• Fixed an issue where the Shift key would get stuck in game.
• Using a /equip macro while affected by certain crowd control spells will no longer cause the items in the macro to be stuck in your inventory.
• Using very low values for SetScale() will no longer cause Mac users to disconnect from the game.
• Default sound channels have been changed from 12 to 32.
• Microphone resources will no longer be claimed by World of Warcraft when Voice Chat is disabled.
• Sounds will no longer stutter and pause if large amounts of creatures are being hit with AoE attacks from multiple sources.
• Sounds caused by spells cast on or by the player will now play more consistently.