If you are using the Presto yum plugin, the key change should have gone
without a hitch, except for the minor detail that there were no
deltarpms for the 600+ MB of updates.
We have managed to get the .newkey repositories properly deltarpm'd now,
but the default fedora-updates-newkey.repo doesn't point to the correct
mirrorlist.
To use the Presto test repositories for .newkey packages, after
installing fedora-release-9-5.transition, you need to set change
fedora-updates-newkey.repo so that the mirrorlist line is as follows:
mirrorlist=http://presto-mirrors.anmar.eu.org/mirrorlist?repo=updates-rel...
For more information, please check
http://fedorahosted.org/presto.
Jonathan Dieter