Since Windows 8 has massive amounts of DRM built-in, why not just set a spec for xbox.next branded OEM provided hardware? Microsoft does this with phones and used to do it with tabets. In the end, what is different about xbox verses something like a Windows 8 RT device? Things that might go on the certification might look like this:
* Boots under 10 seconds * Conforms to DX11 * Scores at level X for benchmark Y * No crapware allowed * Is no louder than Z decibles, under stress * Supports controller spec * Has at least one HDMI out
And OEMs want to do this FOR microsoft because.......?