PlayStation 3 versions of Assassin's Creed games have had exclusive content in the past, and the trend continues with Assassin's Creed III, which promises "60 minutes of exclusive gameplay" via DLC included in PS3 copies of the game.
Sony announced exclusive DLC at E3 2012, but didn't go into detail. However, Ubisoft confirmed with Joystiq that this is the DLC Sony was referring to. As for what that 60 minutes includes, your guess is as good as ours. Here's the box art with the notice on it, via Amazon UK.
What platform were you planning to purchase Assassin's Creed III on? Is the promise of an additional hour of gameplay enough to sway you from PC or Xbox 360 versions?