I would be very surprised if anything from FSX will be compatible with this. Looks like a whole new render engine, not like anything they've done before.
I'll be watching this. I bought X-Plane 11 and uninstalled my FSX. Sometimes, though, I wonder if I should have done that. X-Plane is missing something. I'm not having as much fun with it as I did in FSX. I flew FSX right up intil last year when I purchased X-Plane. I'm not sure what X Plane is missing, but it's not holding me in the same way.

"From our orbital vantage point, we observe an earth without borders, full of peace, beauty and magnificence, and we pray that humanity as a whole can imagine a borderless world as we see it, and strive to live as one in peace."
Astronaut William C. McCool RIP, January 29, 2003 - Space Shuttle Columbia