Thanks - to be honest I am seriously considering returning my licence for a refund on P3Dv4 and waiting to see how the FlyInside sim turns out.
I was really happy when I heard about v4 being 64bit and thought we would be sorted for civvy sims for a while - but with the news from Dan Church, I'm thinking I might be sending my cash in the wrong direction. Let's face it, every time a new upgrade of P3D comes out, it's another $60 (and with a poor exchange rate to Sterling, it's getting more expensive in the UK). We have no idea how long v4 will be the latest, before v5 comes out and it's another 60 dollars and who knows how many expensive add-ons losing compatability.
Whereas Dan assures us the new sim is centred around VR, is 64bit and most FSX add-ons will work with it. I can't see him bringing out a new version every couple of years, at full price, either. I could always purchase another licence for P3Dv4 at some stage down the line (or v5) if Dan's sim goes pear-shaped. Not such an issue for people working and getting a salary rather than a pension, I think, though.
If you haven't seen it:
PS - and my framerates in P3Dv4 are actually down on v3, before I have even put FTX, AS and AI into the sim. average 100fps with v4 and 120-140fps with v3, with all add-ons (on the monitor, not VR, which is gated at 45fps with ASW)