12. What are the plans for drain soul in the new shard system?
Don't know yet. One idea is an emergency backup system for long fights or situations where you screw up. Ideally we don't need this though so we haven't resolved it.
13. Are there plans to make enslave demon a little more viable for PvP and example is the doomguard and inferno?
If you're talking about warlocks stealing each other's demons, I'm not sure that will lead to those demons getting more use. It might make you giggle when you steal one though.
11) Will the soul shard system allow you to empower our primary nukes chaos bolt/soul fire for increased damage on a short cd?
Yes. The example we used at Blizzcon was some kind of duration-limited or "your next spell" limitation. We haven't set this in stone yet.
12) What will happen to soul fire? Will it still require a shard to use? Could it find more acceptance in our normal rotation considering its potentially our most powerful nuke
It won't require a shard. It might require a shard to make it something you want to cast though (imagine a PoM - Pyro).
13) How will the soul shard change work in regards to different trees?
No idea yet. The talent trees aren't done. One thing we threw out at Blizzcon was maybe Demo gets an extra shard, but that's just hand-waving at this point
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