Tom Clancy's Ghost Recon: Future Soldier has a new DLC pack coming out titled Raven Strike that will feature three new campaign missions, along with an additional Guerrilla map, all of which can be played with up to four people. Ubisoft has stated that Raven Strike is a "throwback to traditional Ghost Recon gameplay" with "larger maps, complex missions and an increased level of difficulty." So if you grew up with the older games before settling into Future Soldier, this is probably the DLC pack for you.
The pack currently has a release date of September 11th, and it'll set you back 1200 Microsoft points, or $15, upon its release. As for the PC version, it's not coming on that date, but Ubisoft has stated that it will arrive "at a later date". When that is is anyone's guess, but, hey, at least the PC version is getting some form of love.
Check out Future Soldier if you haven't yet, featuring a satisfying mix of futuristic weaponry and crazy action that we're still playing today.