If you're interested more in the future of Virtualisation (Virtualization if you're from the other side of the Atlantic from me), or where Microsoft is heading in terms of the broad architecture of the Windows "Hypervisor" check out this link to a publicly available slide deck on the Virtual Server roadmap. I've seen more comprehensive decks internally, but these unfortunately are still under NDA for now. Hopefully these will be coming out soon. Steve Ballmer, Bob Muglia and other execs here at Microsoft have made several statements publicly around virtualisation being a core enabling technology - this is absolutely (IMHO) the technology to watch in the future.
You'll either need Microsoft Powerpoint to view the deck. If you don't have it though, fear not. You can use the freely downloadable Microsoft Powerpoint Viewer.
Definitely some good info in the slide deck. I was kind of hoping for some type of quasi-official speculation – maybe along the lines of what I have on my <a href=http://addicted-to-it.blogspot.com/2005/06/longhorn-virtualization-hypervisor.html>blog</a>... Just based more firmly in reality. :).
I think John got the jump on me today with his post, however I just collated this information for a customer...