While I'm sure that the class you're waiting to hear info on the most is your own class, I've got a little bit of a different question for you: Which class do you think is going to be changing the most in Cataclysm?
Will it be warriors, due to the impending rage normalization? How about death knights, since blood will be the only tanking spec after the expansion hits? Will it be hunters with their mana changing to a focus system or warlocks with their complete revamp of Soul Shards? Let us know what you think.