Goog morning to the list, for all users that are interested about KDE Plasma on Centos 8 you can install KDE from epel. All packages are get from epel-playground and epel-testing and some packages seems need to be build. I run "yum grouplist" and see kde workspace available. I tried to install it, reboot my machine and running startx a KDE plasma session was correctly launched. I think that this is a testing release and not ready for production but if you want play you can try. Maybe you will find bug and can help EPEL to fix. Best regards.