The weapon in question is the “Classic Hammerbust” that made an appearance in the first Gears of War title as an assault rifle being used by the Locust hordes.
The new Gears of War title will also boast more bonuses exclusive to the retailer you’re buying your game from. Microsoft has promised to release a list of all the participating retailers and what exclusive bonuses they would be providing on every pre-order.
The contents of the bonuses are unknown but Microsoft did mention skins for multiplayer characters: Young Marcus, Young Dom, Anya, and Alex Brand.
Gears of War: Judgment will release exclusively for the Xbox 360 on March 19, 2013. The game is being developed by Epic Games and will not feature support for the Kinect.