The news comes from two Ubisoft employees' LinkedIn profiles. The personal page of gameplay programmer Paolo Maninetti indicates the Assassin's Creed IV is coming to "PC, PS3, X360, PS4, X720, WiiU." Meanwhile, marketing artist Phil Brolles specifically mentions that Watch Dogs is in the works for the PlayStation 4 and "X720."
So there you have it. Not particularly surprising, but worth reporting nonetheless, if only to bring to light the ongoing incompetence of LinkedIn users.