Spec Ops M.O.U.T. Details on The Adrenaline Vault gives more skinny on this upcoming follow-up from Zombie to Spec Ops, their tactics-oriented first-person shooter. Here's a quote from the story talking about gameplay in Spec Ops M.O.U.T. (BTW, M.O.U.T. stands for Military Operations in Urban Terrain):

Spec Ops: M.O.U.T. will feature a strong single-player adventure, though Long told us the team will be developing just as much multiplayer content, which he calls a combination of Team Fortress' fast action and the careful strategy of Spec Ops. Imagine a futuristic battle in which two groups go head-to-head in a tight urban setting with the sort of death appliances described above. Long said such online battles will be an important part of the game: “We want all the fiction, such as the missions, the equipment, the weapons, and the tactics, to be as realistic as possible, but also be based on what we believe armies will be doing in the future."