I found this, which you probably also found: https://www.avsim.com/forums/topic/6...om-flightfxio/

I haven't done any pay add-ons, which this definitely will be. It seems that this is actually being developed by a third party company, but I see nothing about it being released.

The company's website, flightfx.io, doesn't mention it at all.

I haven't checked available planes, as I really haven't fucked around with all that many. I usually just grab a small plane like a Cessa or a small jet, and fly around places of interest.

I'm guessing it's not out yet, as there's not a single post claiming it's been released.