Resident Evil 6 on Tuesday, December 18: "Predator," "Survivors" and "Onslaught."
Predator casts one player as the bioweapon Ustanak, while all other players attempt to bring the great beast down. Survivor mode augments regular solo/team vs. mode by making felled humans rise as zombies, who must chomp on some noggins before being able to respawn as a person.
Lastly, Onslaught sounds like a weird combination of Gear of War's Horde mode and Dr. Mario's multiplayer, where two players attempt to survive separate waves of enemies, with kill combos sending more zombies to the opponent's side.
Each mode will set you back 320 MS Points ($4) if purchased individually, or 720 MS Points ($9) if purchased as a bundle. No word on when this content will become available on other platforms.
Update: Capcom has uploaded some footage from each new mode – feel free to vault past the break to check it out. Also, Capcom-Unity confirms that a patch will come to Xbox 360 and PS3 at the same time. This free update allows players to adjust the camera's field of view, and adds co-op to the Ada campaign and the No Hope Left difficulty mode.