Microsoft has stated that it will sunset the Xbox Live Indie Games and XNA Creators Club programs, with the XBLIG marketplace shutting down in September 2017. The announcement comes as the Redmond giant focuses its efforts on the ID@Xbox program for the Xbox One and Windows 10:
As of today, we've stop taking new subscriptions or membership renewals, but we'll ensure that current members who are still working on games have any memberships that expire "topped off" until September 9, 2016. After that date we'll no longer allow new games to be published. All creators with a valid subscription as of today will receive a free lifetime Windows Developer account (normally $99).
In September 2017, we'll stop selling XBLIG games, close the store and pay out all money earned by developers. Of course, players will still be able to re-download games they own and continue to play the games they own.
Longer term, over the next two years we'll be working with game conservationists and creators to preserve the legacy of XBLIG content. We look forward to sharing more details in the future.
The ID@Xbox currently has over 1,000 developers creating indie games for the Xbox One, with all developers receiving two kits, access to access to Xbox One and Xbox Live components such as Kinect and SmartGlass, and a subscription to the Unity game engine.
Source: XNA Game Studio Team Blog