Two official posts from IPACS, in the forum this morning:
"The next major version for PC will most likely be called Aerofly FS 4 and it will be a separate program. Price and release date are not set yet.
Aerofly FS 2 will stay and you can continue to use it of course."
and:
"It's not an update for the existing Aerofly FS 2, it's going to be a new program that you can purchase and install separately."
I find that very disappointing

but like many of you I have several versions of the Microsoft product, so nothing has really changed. I hope backward compatibility will not be a big issue.
MikeW