Ubuntu 18.10 aka Cosmic Cuttlefish is currently in Beta and looking for testers. More details on how to get involved in this can be found here
Looks like it has a some interesting new features, including kernel 5.0 which is another milestone.
Anyway the above page has a link to the usual image archive, so get downloading and testing 🙂
This was posted to Diaspora earlier. Anything that improves the filesystem is welcome, it does however look like the improvements are mainly for flash based devices such as SSDs.
http://www.tuxmachines.org/node/108636
Recent discussion on IRC suggests that F2FS also works on the Pi, but is early days yet,.
Any file system hackers out there.