If you're upgrading from the previous Red Hat 7.1 and you're using Ximian GNOME, then you might want to erase all Ximian GNOME RPMS (use the command: rpm -e `rpm -qa | grep -i ximian` --nodeps to erase the RPMS). Red Hat's GNOME RPMS has been more tested then Ximian's one and there is a conflict between them. You cannot use Red-Carpet on Redhat 7.2 as it will fail with the RPM libraries.
These are the most critical notes about Redhat 7.2. You might want to read the README & the Release-notes which appears on the 1st ISO image.
Oh, and if you already installed it - then have some fun with the new un-official RPMS from Enigma's section of FreshRPMS