Plasma 6 hit the Archlinux ARM repos today, and I started to play around with it.
I tried to update the Odroid N2 to plasma 6.
Pacman would not run because of kuserfeedback5 dependencies
Removed kuserfeedback5 with pacman -Rdd kuserfeedback5
Pacman completed the update after the removal of kuserfeedback5
Upon reboot, both x11 and Wayland gave a black screen with only the Welcome window.
No task bar, or anything else.
Then I tried to create new ddimg and rootfs images for Plasma 6.
pacstrap yielded nothing but dependency hell.
I am going to wait a couple of days to ensure all mirrors will be up to date, and then try again.
For now, if you are running KDE plasma on an ARM device, I would recommend not updating for a while.