I'm excited to see it, not to use it. I'm much happier with GNOME or Sway on Fedora. Unless they provide a way to use it on other distros (which I don't see happening, since they have no reason to), I don't plan on trying it. However, I am excited to see the Rust GUI situation improve by them using it!
I don't see why it wouldn't be available to use on other distros. The current Cosmic Shell can be installed on any. Even if they don't maintain the package for each distro, someone else will.
According to my experience a bunch of Rust programs should not be too hard to run on other distros. At least NixOS will have the option very quick after it's release, I believe.
I wish that it could just be as easy as running a few Cargo commands. Though, I have not taken a look at how the project is made/programmed or anything. I wish it could be as simple as
We use casey/just as a better makefile alternative. Shared system library dependencies will be listed in the debian/rules file, and most things should compile and install with just && sudo just install.
It's already packaged on multiple distributions, albeit in an unofficial capacity. If you are on Pop!_OS, you can install the cosmic-session package today, then enable Wayland in the gdm3 config. We have an apt-manage tool which you can use to add development branches. A popdev branch is created for each branch on GitHub pushed by a team member.