3DRealms announced a new game today called Earth No More. Few details about the game are available on their website, they recommend you to buy the July 2007 edition of Game Informer magazine.
"The development team is specifically moving away from what they call the 'lone hero,' while also avoiding a squad-based direction."
"'We're going to design almost every weapon in the game to where it's going to have a sort of collaborative mode to it,' says Miller. One gun called the Linker works like a reverse proton pack from Ghostbusters."
"The good guys aren't the only ones who can team up, however. Enemies are being designed to complement each other's skills as well."
"The team is intricately analyzing how group dynamics work in movies like the Alien, The Thing, Invasion of the Body Snatchers, and 28 Days Later, hoping to emulate that kind of tension in game form."
The game will be available in 2009 for the PC, Xbox 360 and PS3.