A glib response from a Crytek representative may have revealed that Crysis is coming to the Xbox 360. The rep reportedly told Primotech that the Xbox 360 version was being shown behind close doors to "prospective publishers" at last month's Game Developers Conference.
This is far from a confirmation; the Crytek rep may have misspoken. Furthermore, we'd be surprised if Crysis PC publisher Electronic Arts didn't have the foresight to secure rights to the console game as well. We do know that Crytek planned on showing off a console version of CryEngine 2 (which runs Crysis), and although the assets were likely Crysis, perhaps the prospective publishers were just looking for a game engine.