Microsoft Metro

Apparently Microsoft is developing a new document printing specification, at present called Metro. Which raises a couple of interesting issues:
1) So it's XML based. SO WHAT?
2) Exactly what problem is it trying to solve that postscript has not already solved
3) How are they going to get it adopted? No point in my generating metro documents if you cannot read them. So who'll take the first step?

Is it just me or are they doing it just because they can?

Conspiracy theory: suppose they want to
- Come up with a universal document format for EVERY DOCUMENT regardless of type -- html, word processing, text, etc
- Go into the printer business
- Attempt to challenge Photoshop and Pagemaker in the media creation business?

Hmm....