Do Arch and NixOS count? We're in the core package repositories for them, and have packages available for a list of others.

We're not aiming to be in GUI installers yet, that'll be sometime after taking the experimental label off. We're still going slow and steady; I don't think about doing things that will bring in more users until incoming bug reports are dead quiet (or as close to it as they ever get), and the userbase has been going up plenty fast all on its own by the activity I see.

So, sometime next year we'll be working on distro stuff again. Dunno when, I expect another spike in new users and bug reports when I take the experimental label off.

now that 6.18 is the new LTS kernel, will I have a good experience with bcachefs if I stay on that LTS kernel instead of tracking newer stable kernel versions?

I currently run NixOS with ZFS-on-root, and because ZFS is also out-of-tree, the "stable" ZFS version in nixpkgs isn't always compatible with the most recent stable kernel. to keep things simple I tend to just stick with the LTS kernels.

previously when I've tried to experiment with bcachefs on NixOS I ran into a catch-22 where I needed to upgrade to a newer kernel to get bcachefs support but doing so wouldn't be compatible with ZFS.