Warlords of Draenor hotfixes have been published the 08/21/2015 ! Here is the patch notes :
Patch 6.2 Hotfixes: August 21 (Source)
Raids and Dungeons
- [Requires a realm restart] Corrected an issue that could cause players to die outright instead of having their souls devoured when suffering multiple simultaneous fatal damage events.
- Fel Lord Zakuun
- Cloven Soul now provides a 4-second immunity to Wake of Destruction right after it's been applied to the player.