I HEAVILY feel that it won't just be a switch to a DX11 executable...

http://twitter.com/CRYTEK_TIAGO
Quote Originally Posted by Principal R&D Graphics Programmer at Crytek
Cooking some great DX11 tech bits for C2 fans, be patient guys. All I can say, is that we have 16 ms or more to have fun with pc hardware...
I love how people assume they can't add tessellation... It wouldn't be the first game to do so via a patch you know. Metro 2033 ring any bells?