I wish I could say I worked on this, but I just wanted to comment on how amazing it looks - I hope there's a lot of motion capture, otherwise my head may explode from the amount of awesomeness if I discover it's all key framed. Make sure you watch the 720p version and in full screen. ;)

The trailers for the previous games are also equally impressive, getting better with each year - here's the one for Brotherhood:



Assassin's Creed 2, and the original Assassin's Creed trailers. All brilliant! So easy to forget they're CG at times.