Unity 4 realtime rendering, in collaboration with Passion Pictures, the credits say.
So far as I can tell, this was done as a demonstration of the animation software that makes it possible. I don't know whether to marvel more at the brilliance of the software engineers or the fact that there's so much money sloshing around the industry that it makes sense for them to put together something this spectacular.
In any event, I've been there. This is what waking up is like for me most mornings.