The ad comes the day after Gears of War developer Epic Games' Clifford Michael Bleszinski was due to appear on Late Night with Jimmy Fallon--an appearance that was bumped back to next Monday in favour of teenage heartthrob Justin Bieber.

It also confirms one portion of the rumors making the rounds--the expected release date--though other details like underwater combat are still unconfirmed.

Shacknews was unable to confirm the ad's presence on Xbox Live, though Microsoft has had ample time to pull it. We'll no doubt hear the official announcement on Monday.