Crytek and EA have released the Crysis 2 multiplayer demo early, the PC demo gives you access to two multiplayer maps: Skyline and Pier 17. There's also two game modes from the full game included.
Team Instant Action which is a deathmatch style option where your main objective is to kill as many opponents in a certain amount of time. The other mode, Crash Site, which is similar to King of the Hill modes where you fight to control alien drop pods and rack up points in the process.
Grab the Crysis 2 Multiplayer Demo here