Microsoft sends 2000 developers in 25 feature teams into the race creating the next release of Windows, Windows 7. They started a blog and reporting on progress and features I guess. They are open to the community to feedback and comment. We should keep an eye on this until 2010 (planned release date).
Check it out @ link
Btw, Microsoft announced there will be no major revamp for a server version of Windows 7.
Check the details @ link
