I found this when looking in google for Windows Vienna:
http://tech.cybernetnews.com/tag/windows-vienna
It seems interesting. I can't wait to get some official photos from Microsoft, and see if it will look this way.
Well, let me think...
I would say, more security. Very important.
A new interface would be nice, the "Start" philosophy is starting to get old. I have heard that there will be "pie" menus in Vista, so looks like this will be in Vienna.
More efficient memory usage. IMO, Windows Vista uses...