According to a recent report by Win Rumors, Microsoft is getting ready to launch an Xbox Live subscription service at this years E3, which is reported to be called Xbox Live Diamond.
According to the report, Microsoft is in talks with a number of content providers and is hoping to have the deals signed in time so that they can demo their Xbox Live TV service at this years E3.
The service is reported to be similar to the Sky Player service that is available in the UK on the Xbox 360, and will deliver TV content similar to cable to Xbox Live subscribers for a monthly fee.
Source Win Rumors