...
This has mostly worked out well, except that the mimic release received
less attention that we wanted due to the fact that multiple downstream
Ceph products (from Red Has and SUSE) decided to based their next release
on nautilus. Even though upstream every release is an "LTS" release, as a
practical matter mimic got less attention than luminous or nautilus.
Speaking as (one of) the Ceph packager(s) in Fedora:
1) I have been told (don't recall by who now) that odd numbered releases are experimental or short term support or red haired step child releases.
2) even though there have been ceph-{10,11,12}.0.z tarballs on
http://download.ceph.com/tarballs/ in the past, there still isn't a ceph-15.0.0.tar.gz there. And I was told that there wouldn't be one. Yes, I'm aware that X.0.z are alpha releases, X.1.z are beta releases, and X.2.z are GA releases.
3) ceph-13 was skipped over in Fedora because I could never get it to build in Fedora in the limited time I make to do upstream packaging of Ceph and other things (because it's not my $dayjob.) And there seemed to be no interest on the part of anyone in the Ceph devel community to fix it (because see #1?)
If Octopus is really an LTS release like all the others, and you want bleeding edge users to test/use it and give early feedback, then Fedora is probably one of the better places to get that feedback.
My 2¢.