Fedora Kinoite beta/nightly too. Based on current Fedora with coming KDE Plasma. Works pretty well.

rpm-ostree rebase --reboot ostree-unverified-registry:quay.io/fedora-ostree-desktops/kinoite-beta

I think that was the command. Confused a bit, even though I use it so I can check the remote name in a few days.