People that are constantly asking about DirectX 11 need to do some research on its features first, think about it and then go back to enjoying this awesome game.
DX 11 has only one feature which has any impact on quality and another which might have an indirect impact. The first one is tessellation which can be great if you want a close up of a characters face or something similar but most of the time it will be used to "improve" low poly objects in the scene like a bucket...which you wont probably even look at. The rest of the time it will just be reducing your performance with little to no impact on the visuals.
The only other feature in DX 11 is improved support for multi-threading which probably does not provide a significant enough increase in performance because the game is optimised enough to be played on consoles.
Shader Model 5.0 provides some features to make a game programmers life a bit more easy but does nothing for the gamer.
So the end game here is while they can add DX 11 support and maybe provide a marginal performance boost it wont do anything for the looks unless we get some other candy in the patch as well.
Now load up Crysis 2 and enjoy it