BioWare. After Mass Effect, I have no doubt in what they're capable of.
Bethesda only made one good game in my book, and it's Fallout 3 (even with that old engine they've been using forever).
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...