Planet Xbox 360 has put together a small preview of Gears of War's single-player/co-op mode. Details about Microsoft's self-proclaimed killer app are surprisingly slim -- the E3 showing was limited to CliffyB's demo at the keynote, followed by 'backstage' multiplayer sessions -- so the Planet Xbox 360 piece likely contains some tidbits you've never read about.
The preview covers the basics, including plot, gameplay, and weapons. You'll learn about planet Sara, the Pendulum Wars, the Locust Horde, and the Coalition of Ordered Governments (COG). You'll begin to conceptualize how CliffyB and the Epic team have laid out the controls and designed the AI. And, you'll start to imagine the ass-kickings you're gonna dish out with toys like the Hammer of Dawn, the Torque Bow, Bolo Grenades, and the chainsaw-equipped Lancer Rifle.