HiFI Simulations explains how they are going to support, or try to do so, the current and latest flight simulators.
For Flight Simulator, they still need to get an access to the weather engine, with more complete SDK. Until now, they are “not aware of any weather extensibility” but MSFS remains “a future potential platform to develop on”.
For P3D5, the Open Beta has been extended, and they are waiting further updates on the implementation of TruSky cloud depiction.
And for X-Plane v11.50, ASXP has been updated to fully support. New developments will bring enhanced visuals and enhanced realism in a new version of Active Sky for this simulator.