One of the more impressive aspects of the development is actually the multiplayer. While anyone will be able to jump in and play some deathmatch type games, there will also be a co-op multiplayer mode added on top of the single player campaign. Up to three players will be able to fight through entirely new scenarios together with a completely different story. This should add some terrific replayability to a genre that already manages to stand up to hours and hours of play as it is.