Most of the imperfections mentioned in the release notes are around graphics/video cards. This is something that will be looked at closer in upcoming Fedora releases. Most significantly, this marks the first official Fedora release for ppc64 since the Fedora 12 time frame. Our preliminary feedback on Fedora for ppc64 has been positive. There a number of instances where it is being used heavily in open source projects.
Please feel free to try out the latest Fedora version and the team is always looking for new members who are wiling to hack for the better of Linux ppc64.