This is an extension onto the post from a few days ago on the Modern Warfare 2 trailer.
As promised here is the trailer in full. It looks amazing. The footage definitely isn't pre-rendered, it is the in game graphics but some of the animations look extremely complex for an FPS (throwing an enemy over your shoulder for example). I'm just wondering how they'll pull it off. But if I was to trust anyone with a first person shooter it would be Infinity Ward.