This trailer fleshes out a bit of back story about Constantinople, the main location in Assassin's Creed: Revelations.
A prince trying to keep the city from being overtaken by a rebellious faction and Ezio's own appearance in his own journey certainly make for an interesting tale to be woven through the streets of Constantinople.
Just remember, it's now Instanbul, not Constantinople. For those of you that don't get the reference, video after the jump.