I don’t know what cave I have been living in, but I discovered a new (to me) repository named KDE-Unstable. Who knew ? 
https://archlinux.org/packages/?sort=&repo=KDE-Unstable&q=&maintainer=&flagged=
Pudge
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I didn’t know either and I just installed Arch a month ago.
Now that you pointed it out, I found a reddit thread from 2 years ago with a link to the arch kde unstable repo. So, apparently it’s not completely new.
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It has been around for a long time (presumably years), but I don’t know exactly how long.
Testing stuff, like the other testing repos.
But must be something special since it is not advertised as other testing repos in /etc/pacman.conf.
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It should be added by the users themselves if the want to update to the packages in this repo:
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