The installation proceeded without any incidents, all the updates came down from the internets and installed just fine, including the latest Firefox release, version 10. What's interesting is how performant Firefox 10 is compared with older Firefox releases, especially when executing in a virtual machine.
One key reason for installing Fedora 16 with KDE was to replace OpenSUSE 12. The lab is comfortable with Fedora (we are, after all, a RHEL site as well, paying for Redhat support). I was pleasantly surprised to see that Marble 1.2.2 ships with the KDE desktop. I searched for it via KDE's panel and found it after a few keystrokes. It looks and runs the same as the version that ships with OpenSUSE 12. I can now continue my KML experiments with Marble.
One more comment about KDE: Install it, use it, live with it. It's done. Good job, KDE developers.