Microsoft has inadvertently leaked the existence of Gears Of War 3 by prematurely running a Gears of War 3 ad on Xbox Live. What was probably supposed to coincide with Epic's Cliff Bleszinski's announcement during the Late Night with Jimmy Fallon, which was postponed last minute until next week, the Gears of War 3 existence is not really much of a surprise. According to the advert, the next installment in Epic Games' action series is currently scheduled for release in April 2011.