This week's KDE update with notably =
Wayland Fractional Scaling
“What does this do?” you might ask. It allows the Qt toolkit to turn on its pre-existing fractional scaling support on Wayland that it always had on X11. No more rendering to an integer size and then scaling down! This should result in Qt apps that are scaled to anything other than 100%, 200%, or 300% scale having better performance, less visual blurriness, and lower power usage.
Nice Things.
Multi-Screen
That’s all changed. You can read the details here. In a nutshell, we now use an index-based system, with index numbers bound very tightly to Plasma containments, but index numbers themselves being able to move between screens based on how many screens there are. So for example, when screen 1 with your Plasma desktop and panel becomes unavailable, a new screen becomes screen 1, and the Plasma desktop and panel bound move over to it.
Worth reading in full.