The fact that the demo was from an XBOX and that they will release a demo for XBOX, makes me suspect that this game will have some optimization problems and will not receive the required PC support.
Moreover, the fact that they're basically not showing the PC version at all, not boasting about graphics or doing anything related to what they did in the last 2 crysis releases makes me believe that this game will by no means be the new graphics-top-dog the previous two games were.
Don't take my comment in the bad way, i'm looking forward to any improvements this game may have when compared to CryEngine 2 (specially graphical, optimizations, and physics).
I'm rather tired of developers releasing games using the old Quake or Unreal engines.
Just remember, this is all an opinion