A purely speculative thread:
What do you think the new Caverns of Time 5 Man is going to be?
Personally I think it's going to be the backstory behind Deathwing, either his change from Neltharion to Deathwing, or his banishment into Deepholme. I think Blizzard has realized a lot of people feel disconnected from Deathwing as a villain, so they are going to patch up the holes and fill people in on the situation.