I'd buy it day one!!! I'd probably even pre-order it. When I first got back into PC gaming around 2008, it was because I wanted to play Crysis. The music and sound effects still make me all nostalgic. The atmosphere in that game is still one of the best ever.
I will always look back on the countless hours I spent using the Crysis benchmark with my trusty 9600GT and then my 4850 overclocked to their max trying to get Very High to run at 40 fps with the utmost fondness lol...