According to NeoGAF: a work in progress version of Gears of War 3 has been leaked online. It has the full single player version and all the multiplayer options. But this leaked version is very buggy.
How in the world this game got leaked so early? Shame on you! One thing I hate is spoilers.
If you want to have a better experience with the game and don’t want to get banned from Xbox Live. Then wait until the official version comes out on September 20, 2011. Plus Epic Games has been working on this game for 2 years. Let’s support them.