Luis Davila at
building #kf5 and #plasma-next from git #aur packages in #archlinux after some months using it from official repos... ready to discover 
Well, KF5 is very up to date in the repos (5.6.0). Plasma5 is a different story =)
yes you're ok but i wanted to test it :p .. About versions, both, KF5 and Plasma5 are up-to-date in repo, plasma 5.2 is still in beta version, so still not landed in [extra] repo. Whathever, almost all works fine ;-)