It has taken a few weeks longer than we had hoped, but Korora 21 images are now available. I strongly recommend downloading with BitTorrent if you can.
The 21 beta was quite successful and we were able to make some minor changes to help improve the overall experience. Users who are currently on the beta need not re-install, updates are provided via the package manager. Users who are on 20 may consider upgrading, however this is not necessary as version 20 is supported for another 6 months or so.