ESRB, the American version of European PEGI, are often responsible for games being leaked in advance of their official announcement. On their website they now list the first Crysis for Playstation 3 and Xbox 360.
Now, it could be a mistake of course. Some happy intern might have put it in, or something. But the thing is that the same game is listed for the HD-consoles over on the Korean version of ESRB/PEGI. That kinda points to the game actually coming, so now we just have to wait for the official word from Crytek and EA.