looks like its been leaked.
This is a downloader that will allow your console to download the Gears of War 3 Beta once it is released on Xbox Live, this is expected to be in the next couple of days.
You will need 2gb of free space to download the Gears 3 Beta once it is released.
This will save you buying the epic edition of Bulletstorm to access the beta.
How to use:
This does not require a Jtagged console, simply transfer to the Content\0000000000000000 folder on either an Xbox 360 formatted USB drive or the Xbox 360 hard drive.