Warlords of Draenor hotfixes have been published the 02/19/2016 ! Here is the patch notes :
Patch 6.2.3 Hotfixes: February 19 (Source)
Creatures and NPCs
- Fixed an issue that could cause Mahka, a quest NPC in Southern Barrens to become unresponsive.
Raids and Dungeons
- Upper Blackrock Spire: Fixed a situation on Challenge Mode and Mythic Difficulty that could cause Ragewing the Untamed's Engulfing Fire ability to be unavoidable.
- Lovely Luck Is On Your Side: Fixed an issue that could cause players to not correctly receive credit for completing this achievement.