To make a few things clear:
- ProSimB738 V3 is still planned to be fully compatible with prepar3d v4.5. There are no plans to remove Prepar3D v4.5 compatibility anytime soon.
- There is still a lot work going into V3 with another update today. V3 was a big step as announced with many things got completely reworked. There might still be some rough edges, but we are working hard to get everything smoothed out - just be a bit patient please if there are no immediate replies.
- The V2 will no longer receive any feature updates. We still do apply some hot fixes (as you saw there are still updates coming for V2 from time to time) in urgent cases though till V3 is fully stable.
- And yes, we are also working already on FS2020. Although we cannot provide a fix timeline for that yet, you can expect something is coming in this regard as well.