Crysis has been announced to be coming to the 360 on the 1UP show. A developer talking to the 1UP guys when they were at CES revealed several details about the 360 version. Two other games also announced are Warhound and CrimeCraft.
Crysis is coming to the 360. However, that PC game won't be the same game as what we will see on the home console. Because Crysis will be running at DirectX10, the game would look inferior since the 360 can only do DirectX9 (as mentioned before). So, the developers are using the same universe that the PC game is set in, with some similar story elements, but the gameplay will be entirely different. The developers told the 1UP guys that they weren't even going to try and replicate Crysis. This would be because the PC version will be running so much more stuff that the 360 couldn't handle, and would be disappointing. They stated that the game needs to run deeper, with the physics and world needing to be constructed differently.