I wouldn't be surprised, not at all. I think there's a fairly good chance they'll announce it but I can't be sure. They might as well not announce it and I wouldn't be surprised in that case either. However, they are working on something at the moment, that's for sure. I think they would have made an announcement if it was Crysis 2 so I think it's probably a PS3 version of Crysis. It won't be a straight port (they've said it would need changes) though.
As for what comes to an X360 version... I *think* Crysis is going to be a PS3 exclusive but there's a good chance of it coming to X360 too. After all, CryEngine 2 supposedly runs on both PS3 and X360.
Or maybe they'll just announce multiplatform Crysis 2. Or maybe they'll announce nothing.
EDIT: Oh, and Crysis looks terrible on low. Trust me, I've experienced it. It looks terrible because that's not the way it's meant to look like. Uncharted on the other hand looks great even on SDTV.
