Now, does it
Attempting to run gnome-session immediately fails. gnome-session is the application that starts GNOME 3.0.
gnome-session: symbol lookup error: /opt/gnome/lib64/gtk-3.0/modules/libcanberra-gtk-module.so: undefined symbol: gtk_quit_add
This is bug 32839. At quick glance this bug doesn't seem too difficult to work around - remove the offending line of code or roll back GTK+ 3.0 to the parent of 7e7d8c4.