This is a release where quite a few changes that have long been wanted finally can be implemented. The longest wanted of those is the final removal of Python2 from KaOS. The default install has been Python2 free for quite some time, but some major packages had still required it to build, now the last one of those, QtWebEngine, has been patched to build against Python3, so now KaOS is completely Python2 free.
Second is the move to Pipewire (away from PulseAudio) as the default sound/low-level multimedia framework. A switch had been planned for a while, but there were some issues on a Wayland session, so it had to wait. Those are now all resolved, and you will see Pipewire as the default on this ISO.
For those who still prefer PulseAudio, the installer Calamares now has a module added (KaOS only), that gives users the option to select which sound server they prefer (with Pipewire set as default).
Third is the removal of QtWebKit. Upstream Qt abandoned it some ten years ago, but a fork picked up maintenance. Unfortunately, that maintenance stopped a few years ago, so it is time to move away from QtWebKit. All that still depended on it are now ready to move to QtWebEngine. A couple could not do that move, thus they were removed from the repositories.