Here we go.
From PMDG :
End of Development for Xplane platforms:
For some time we have been watching market metrics with the Xplane platform and evaluating our own development schedule in order to find a gap into which we can slide a dedicated Xplane development cycle. As part of our strategic objective to simplify our development agenda, we are pivoting to dedicate all of our development resources to our Prepar3D v4 product lines and to our upcoming Microsoft Flight Simulator product lines. Effective immediately, we are no longer evaluating an Xplane development cycle at any point in the current five year window, nor do we see any active XPlane development time being allocated at PMDG.