The very small blurb that FFG uses to describe Gears of War: The Boardgame makes me think it may be like Doom, but with squads.
" Gears of War is a tactical game featuring squad-based combat based on the hit Xbox game by Epic Games."
I've often contemplated taking the Doom rules and converting them into a game that would play similarly to Space Hulk, Mutant Chronicles (Siege of the Citadel, not the new 54mm version) or Space Crusade. It wouldn't be too hard to make Doom into a squad-based funfest, even if it was just two-man squads.