Got Crysis now, and apparently you have to upload the entire game for servers. Kind of a bummer, but at least the game is not out in America yet - plenty of time to get the files up and ready.
Btw, I think Crysis just has a steeper learning curve than other games. Once you start using all the suit modes effectively, forming explosive traps, and working with people as a team, it becomes incredible fun.
I was playing with 6 people in a Beta using Vent, and we filled two Hummers and were driving around the map capturing and defending bases. It's like a much better version of Battlefield 2 basically, well, at least in my opinion.