Microsoft and Universal: Zune Device Royalties

According to the Zune Insider website, Universal Music Group will receive a device royalty on every Zune sold. Specifics of the deal are not forthcoming from either Microsoft or Universal, but the article suggests that a portion of the royalty revenues will be relayed to recording artists. This makes me wonder how the sharing will take place and whether it will use some sort of ASCAP-type model.