The video debuted during Microsoft's E3 press conference. It contains a mixture of in-game action and storyline footage.
It delves into the background of the trial involving Baird and his Kilo Squad, introducing players to COG prosecutor Colonel Loomis.
Earlier today it was revealed that Gears of War: Judgement would feature class-based multiplayer and a Team Fortress-inspired online mode.
As previously reported, the game will be developed by People Can Fly, although Epic Games will be involved to ensure it stays true to the franchise.
> E3 2012: Digital Spy's coverage from the world's biggest gaming expo
> Read our review of Gears of War 3