With polkit version 0.106, .rules files are used instead of .pkla files, see http://davidz25.blogspot.com/2012/06/authorization-rules-in-polkit.html for more information. Therefore, please port the file /var/lib/polkit-1/localauthority/10-vendor.d/11-fedora-kde-policy.pkla to use the new format. If you have any questions, I'm subscribed to this bug to help. Thanks.
I assume it won't work without changing this, so let's mark as blocker to minimize chances of forgetting about it.
Fixed in kde-settings upstream: trunk: https://fedorahosted.org/kde-settings/changeset/463/ F-18 branch: https://fedorahosted.org/kde-settings/changeset/464/
kde-settings-4.9-14.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/FEDORA-2012-15008/kde-settings-4.9-14.fc18
Package kde-settings-4.9-14.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing kde-settings-4.9-14.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-15008/kde-settings-4.9-14.fc18 then log in and leave karma (feedback).