This blog post is already quite long, so it will omit changes merged for Plasma 6.5 (releasing in October, to be announced in a future post).
With the Plasma 6.2 release, we moved Plasma Dialer and Spacebar to the Plasma release cycle, allowing us to have consistent releases of the two apps. This completes our year long move to having all Plasma Mobile related projects released as part of wider KDE releases, streamlining the work for distributions and taking a load off us on having to maintain a separate release cycle!
In other news, a Fedora spin for Plasma Mobile was released! It will only be targeting devices that can currently boot Fedora (i.e. not ARM phones), but is very exciting nonetheless!
Can’t see instructions on how to use it, do I need to do anything non trivial on my phone? Should I test it on an old phone?
You’d need an operating system that uses it. It’s going to be at least as difficult as flashing a custom rom, but likely even more so, as there might not be a ready-made build. Definitely something to experiment with on a secondary phone. PostmarketOS is your best bet, here are others that support Plasma Mobile.