This is the animated trailer for The Beatles: Rock Band I was talking about in the Microsoft Conference opener. For whatever reason the file for this was not online, but thankfully IGN has posted it on YouTube:
Seriously, if there's more of this in the game consider me sold ... maybe. I mean I'm not a huge fan of The Beatles, but their music is catchy, and this game just oozes style. If anything, I'd love to see a new Beatles animated feature in similar sense to Yellow Submarine, but all in this style.
The video, I found out, was directed by Pete Candeland at Passion Pictures; who is responsible for the Gorillaz' music videos, as well as the CG openings to Rock Band 1 and 2. You can see the work at Passion Pictures' site.
For the actual gameplay footage trailer, see The Beatles: Rock Band official website