14 DAY TRIAL // Windows Vienna to follow Vista has indeed been confirmed by Microsoft's blogging guru, Robert Scoble. The new code name for Blackcomb is indeed Vienna. In a thread reply to a channel 9 video he said, "since this video was shot the codename for Blackcomb has indeed changed to Vienna. I haven't gotten the story on this yet, though."
Windows Vista aims to be a technologies-based release, this includes user-interface changes in the form of the Aero set of technologies and guidelines. But for the Vista successor, they've changed that mentality and they are now planning to revolutionize the way we interact with our home and office PCs. The "Start" interface we've grown used to ever since its Windows 95 introduction will most likely be changed to something completely new.
Some other drastic changes are the complete replacement of the Explorer shell. The taskbar will also be replaced by a new concept based on 10 year research from Microsoft's "Vibe" lab. GroupBar and LayoutBar projects will probably make an appearance as well. They will allow users to more effectively manage, track their applications and documents while in use, and there will also be a new way of launching applications. It also seems that Microsoft has taken some ideas from the MAC guys (is this the firs time that this has happened?) and investigated a pie menu-type circular interface similar to that of the MAC.
Although the news is mainly on Vista right now with the upcoming release, focus will probably shift when completion of Vienna is around the corner.