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.
After some weeks of work, we now have in mageia the First Alpha of KF5.
This is the first step to have this new Version usable, as we now need to wait for the runtime and workspace pieces to be available, we miss a task-framework or task-kf5 but this will come later.