Information about the DirectX 11 patch for Crysis 2 accidentally leaked out yesterday (or should that be "accidentally"?), but Crytek have decided to make the whole thing official since the cat had already climbed out of the bag. Patch 1.9 for the PC version of Crysis 2 will be out on Monday and with that comes support for DirectX 11 if you have the hardware needed installed on your rig.
The upgrade will be dependant on a pack of higher resolution textures that will be released at the same time as the patch. More details about the patch, and the textures, can be found on MyCrysis.com.