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Fedora 28 for PowerPC has been released on 1st May 2018. Please find release announcement at https://fedoramagazine.org/announcing-fedora-28/

Try out various variants like Server, Cloud and Docker from following link:

Release Notes

for older notes see Architectures/PowerPC/27

Known issues in F-28

* GUI install - pixman bug
* nested virt with SMP guest
* multipath issue - not Power specific
* crash in debug mode
* virt-install hang
* remove kernel-bootwrapper

Developer information