Developers creating games for Xbox LIVE Indie Games using XNA Game Studio can currently submit games to App Hub that are made in XNA Game Studio 3.1, as well as those made in XNA Game Studio 4.0.
After February 7th, 2011, all games submitted to playtest or peer review for Xbox LIVE Indie Games must be created in XNA Game Studio 4.0. After this deadline, any games submitted that are made in XNA Game Studio 3.1 or any earlier version will not be accepted by the system.
If you are developing a game in XNA Game Studio 3.1, you will still be able to deploy and debug the game on your Xbox 360 console using XNA Game Studio Connect after the deadline, but you will be unable to submit it for playtest or peer review unless you upgrade the game project to XNA Game Studio 4.0.
If you have a XNA Game Studio 3.0 or 3.1 game currently on Xbox LIVE Indie Games, it will continue to work. This release does not affect the ability to purchase or play any game currently on Xbox LIVE Indie Games.