CVG has a story that Crytek will indeed only be making Crysis, their upcoming mega-smash hit in the making using their new DirectX 10 mega-smash engine for PC only:
It crossed our minds," said Yerli on the next-gen question, "but we're sticking with PC. One thing about our company is that we want to focus, we don't want to do multiple things, we want to do one thing and do it well. PC is our focus right now, we were born there and we want to showcase what we can do there, before we made any move onto consoles.
News source: CVG