The upcoming Xbox 360-exclusive Gears of War prequel will be getting a demo of its new game mode dubbed “OverRun” this March.  Gamers who opt to pre-order Gears of War: Judgment at GameStop will be granted early access to the game mode demo beginning on March 15–the demo will become open to the public four days later on March 19.

OverRun mode sounds to be an evolution of the Horde and Beast combined with the traditional competitive multiplayer modes from previous entries in the franchise.  It consists of two timed rounds where players are attacking as the Locust Horde or defending against waves of the Horde as COGs.

Gears of War: Judgment releases in North America on March 19, 2013.

UPDATE:  From Major Nelson’s blog:  “As an added bonus, multiplayer experience points (XP) earned will carry over to the final game for players who purchase and play “Judgment” in the first week following its U.S. release.”