Hi Todd,
NT upgrades to an NT-based system have never offered a revert option. That
only occured when doing an NT upgrade to a 9x system (like Win98-->WinXP),
and only under certain conditions (no file system conversions or upgrades to
the service pack level among them). I suspect that this "undo" will likely
not be a feature of the release product, though there's still nothing set in
stone yet.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org