CM Lore is back tonight with another post of spell changes in the next build for warlocks in the continuing discussion of the Kil'jaeden's Cunning and Mannoroth's Fury talent nerfs. After the break, you may read about a minor note about Rain of Fire generating less embers (specifics currently unknown), so that the developers can further discourage use of the spell in single-target situations.
Fel Flame is being reworked entirely: it will no longer extended DoTs and it has a 1.5 second cast time instead of being instant-cast. In return, Fel Flame will be castable while moving and has received a small damage buff. Haunt, in return, will go back to being interrupted by movement. Affliction is being further compensated for the loss of Malefic Grasp while moving by expectedly moving the damage done power back into Haunt and the three DoTs.
Finally, Kil'jaeden's Cunning and Mannoroth's Fury are both on a 1 minute cooldown (down from 1.5 minutes) but also a lowered duration of 10 seconds (down from 15 seconds). Mannoroth's Fury applies to only the main AoEs but it provides a 100% damage increase to the specific AoE spells as well as the expanded area.