As it seems the Crysis demo has been officially delayed. Here is the announcement by Cevat Yerli, President and CEO of Crytek:

First, I am sorry for the bad news - the Crysis single player demo will now be available everywhere on October 26th, 2007. We are taking some extra time to make sure you that you have an amazing experience but also we did not want to risk the release date of Crysis at this stage. To get the game into your hands by November the 16th, we had to make this call.

Now the good news - the big surprise. The SP demo will be released with our CryEngine 2 - Sandbox 2 game editor, giving the community the opportunity to get familiar with the vast amount of tools they will have at their disposal four weeks before we ship, something we have always wanted to do.

This is an exciting time for us at the studio as the development of Crysis comes to an end and we are only a few weeks from Gold Master. We appreciate your patience and are looking forward to getting Crysis into your hands on November 16th. Thanks, Cevat Yerli, CEO & Crytek