From Fedora Project Wiki
Gnome Shell session?
For the many people that will surely be reluctant to switch to using gnome shell, how will the classic interface be available? Through a separate log-in session? or otherwise?
The GNOME 3.0 was Rescheduled for March 2011 http://www.gnome.org/press/releases/2010-07-gnome-3.0-rescheduled.html
-- Rodrigo Padula