Microsoft’s XNA Game Studio team announced a new feature on App Hub that they’ve added to the peer review system for Xbox LIVE Indie Games. “We’ve enabled developers to control the release of their games that have passed peer review. This feature will help developers to better coordinate social networking, press, and other opportunities for the release of their titles on Xbox LIVE Indie Games,” informed the team.
How Does it Work? By default, games will automatically be published when peer review is complete. This change adds a check box that developers can check if they want to control their games' release.
If the developer checks this box, the game will stay in a "ready to publish" state after passing peer review. The developer can then return to the game's page and click the "Publish Now" button, which sends the game to the Xbox LIVE Indie Games channel on Xbox LIVE Marketplace within 24 hours.
This system works in a similar way to the Windows Phone Marketplace, which allows developers control over their app releases.
[Source: XNA Game Studio Team Blog]