On the official Crysis blog, Crytek posts:
"We know that some people have been playing with an unfair advantage in the Crysis 2 demo. Rest assured that although the demo does not have these features installed, our team has been working for some time on various anti-cheat measures that have been introduced for the retail release of Crysis 2. We would like to make sure everyone is aware of how important this issue is to us, and that we will continue to strive for a cheat-free community with Crysis 2.
A cheat-free Crysis 2 launches on March 25, 100 in the U.K. Well, we can all dream can't we?