Ezio and Altair get together and all of a sudden the world thinks DubStep is good music. It's not good music. It's bad music. That doesn't change the fact that this is a pretty good trailer, showing off tons of Constantinople and even more of Altair's previous life.
If you're just coming back from your epileptic, DubStep-induced seisure, I'll take this opportunity to inform you that Assassin's Creed: Revelations will be available on PS3 and Xbox 360 November 15th. The PC version will be on store shelves in December.