lightweight nice looking UI Elements to be easy implemented.
At the moment it is a slow because it still has a big footprint of two systems running, I think .
I hope the two systems will do a good job and work together.
Plasma is great I tried it some days ago.
For Orbiters, a small KDE (Kiosk mode of KDE is great) should work really well in future.
The new KWin will also handle Hardware requirements better, so graphical effects will be disabled if the hardware is not strong enough.