At CES DirecTV Announced two items: DirecTV 2GO and a Partnership with Microsoft.
The first as stated in the Press Release, DirecTV 2GO is at first going to be for hand held video players, but nothing specific about computer usage.
The 2nd was from Micrsoft, stating that a partnership has been struck between them and DirecTV to allow the new DVRs (R15 and HR20) to communicate with the Microsoft Media Center edition PC and that Intel (IIRC) is working on building a PC - DirecTV Tuner card for the Media Center....
More specifics where not released. Some reports have D2GO to be out in 3-5 months, with the Microsoft Media Center communication 6-9 months out, and the tuner card in about a year or so.