Weighing in at 739.32 MB on Xbox Live Marketplace, the online taster lets players sample OverRun mode, the series' first class-based, competitive multiplayer offering.
Essentially, OverRun transplants Battlefield 3's Rush mode to Gears-sized maps, retrofitting it for five-on-five matches, we said in our Gears of War: Judgment review.

Any XP earned in the demo will carry over to the final game if you purchase and play the shooter in the first week following today's Gears of War: Judgment release date.