Ubisoft casually mentioned some details about the next entry in the ever popular Assassin's Creed series. The game is being developed by a new team, and will feature a new hero in a new time period. It is described as a major leap forward, and it is due out in fiscal 2014 (April 2013-March 2014). Likely it will be released around the same time as Assassin's Creed titles have been released the last few years (i.e. end of October, early November).
Whether or not this game is going to be called Assassin's Creed IV remains to be seen. And there is no information as to what platforms it may appear on.