The Initative and Playground's RPG studio. Those are the two new large AAA studios.
The Initiative, what’s their current employee count? I heard less then 100 but I assume they can staff up on temp workers when they have a concrete plan in place. But even with 100 people you can make a AAA game if you have enough time. 4 years at least I’d say (it’s been almost 2 now I think)