GameStop has been dropping hints about its digital download plans for a little while now, but it looks to have done its most extensive and official talking about the matter yet at the recent BMO Capital Management Digital Entertainment conference, where it confirmed that it will start testing the program "early next year" with kiosks in an unspecified number of stores. That program will apparently work in conjunction with services "such as Microsoft Corp's Xbox Live and Sony Corp's PlayStation Network," and will focus primarily on add-on content rather than full game downloads. Why's that, you ask? Well it seems that GameStop thinks "a large market for full game downloads is not imminent, (but) the add-on downloadable market will grow" --