something is being worked on with KMEM?
What's wrong with KMEM ? It's certainly not "old", and it's already using some native P3D items, where it matters, on the ground polygons.
The issue is, it's all done automatically with our Live Updater, and our scripting engine can automatically enable the native P3D stuff if you are running under P3D so, it's just works without doing anything.
Other developers might require them to let you know there's a new version, uninstall the old one, download a new installer, and install it...which might be good for marketing ("wow, xxx released a native P3D4 version!!"), but it's surely less convenient than getting automatic updates, sometimes even without having to restart the sim.
For the record, KMEM was updated to support native P3D ground polygons since December 2016, and KSDF and KCLT were released already with this feature and they also automatically switch between FSX polygons and P3D polygons dynamically, depending which sim they run under.