A bunch of new images for the set-in-Renaissance-Italy Assassin's Creed II have appeared on Mondo Xbox, a site based in--where else--Italy. Via a Google-translated page, the site "entered into possession" of the shots... and that's all the explanation for their presence. So I'm just going to put these up, let you look at them, and slowly back away.
Gallery
EDIT: Yes, as Mondo Xbox points out, a number of these shots appeared in Game Informer, though some of them are also new.