Things moved recently about kf5 in mageia. We had, since a long time, the framework part.
Now that the first stable release is out we packaged the desktop/workspace release based on KF5.
Unfortunalty this can’t be co-installed in parallel of KDE4. For the moment ( not yet clean packages ) you have to follow those steps:
1- Remove kdebase4-workspace ( this will remove a bunch of packages workspace dependant ( plasma applets, etc).
2- install plasma-desktop and plasma-workspace
3 restart your session and in your favorite DM go in KF5.
Keep in mind that those are experimental packages.
To report « packaging » bugs, please go to the Mageia Bugzilla
To report funcionnal bugs, please go to KDE Bugzilla