Gears of War 3 is an upcoming third-person shooter video game developed by Epic Games and published by Microsoft Studios exclusively for the Xbox 360. It will be the third installment of the Gears of War series, and the final game in the current story arc. The player will once again play as Marcus Fenix, although at several points throughout the game, control will change to other characters.
Eighteen months after the fall of Jacinto, the remnant of Jacinto moved to the island of Vectes to rebuild. After a generally quiet period, the Imulsion infected Lambent began to emerge from the ground. Hiding something, the COG head of state, Chairman Prescott, abandoned the COG. Now leaderless and being forced off the island, the COG disbands and separates to the safest places left. Victor Hoffman takes some survivors to Anvil Gate while Delta squad sets off on the "Raven's Nest" naval ship with the remaining humans to avoid further Lambent incursion.
Source: Wikipedia, "Gears of War 3", available under the CC-BY-SA License.