Built on the Unreal 3 game engine, Gears of War takes place on a retro-futuristic world that’s very reminiscent of Warhammer 40,000, with dark gothic atmosphere, and a mix of WWII-era, modern, and futuristic tech elements.
One of the coolest gaming features is realistic behavior regarding cover. If you (or an opponent) take cover behind something and an opponent starts hammering away at your position, the cover will react as real material might (e.g. a brick wall will chip, shatter, and eventually, fall away, leaving you exposed).
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Click here to see IGN’s full coverage of Gears of War, including trailers.