Omg do you guys read any news???? .... I guess not b/c if you did a bit of research you wouldn't be here quareling
Crytek have said that in the full version you will get all the graphic tweaks as previous versions, they only kept it like this to reduce the demo file size (lol what?!?!)
If you go on Nvidia's webpage and find their 560Ti announcement, you will see that they write "Great card for playing Crysis 2 in DX 11) --> So I think it will be safe to assume the retail ver. will have Dx11.
As for graphics quality, we can't know for certain. I thought the demo looked pretty amazing, however I didn't feel blown away. My only concerns were flat 2D surfaces/textures (i.e. carpeting on the floor/ plywood around the place etc.)
However, that should be solved through by the tesselation offered by Dx11
In short, don't moan about the game until its out...