EA and Crytek have released information and screens from two multiplayer modes - Crash Site and Team Instant Attack. Here is the unedited, and rather brief description from the fact sheet:
Crash Site
Crash Site is a team-based game mode where 2 sides compete for control of Ceph Drop Pods launched periodically into the map by dropships patrolling overhead. Teams score points by guarding the pods and keeping enemies at bay.
Team Instant Action
Team Instant Action is a standard game mode pitting 2 teams against each other. Kill as many opponents as possible, whilst attempting to minimize your own deaths. Use the Nanosuit to sneak up on enemies in Stealth mode, or charge in and gun them down in Armor.
Have a look at the screens as you await the release of Crysis 2... It's not coming until March, so you're going to have to wait quite a while.