Old and weak XBLA titles to be delisted
Speaking in this Next-Gen interview, Marc Whitten, general manager of Xbox Live, has revealed that XBLA titles that have been out for more than six months, have a Metacritic score of less than 65 percent, and have a conversion rate of less than 6 percent will be eligible for delisting.
Microsoft will apparently give three months of notice before these titles are removed.
More through the link, including details on upcoming DRM changes to Live content and final confirmation that there won't be a spring 360 dashboard update this year.