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.
Angel (the x86_64 deltarpm mirror manager) and I (the i386 deltarpm
mirror manager) have (hopefully) managed to get the .newkey repositories
properly deltarpm'd.
To use the Presto test repositories for .newkey packages, 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...
I will make this announcement on fedora-list and update the appropriate
page tomorrow if no major problems are reported.
Jonathan