It's difficult to know if Panasonic will do another small rangefinder style body in MFT. I feel it is unlikely.
The likelyhood for a GX10 increased IMHO with the launch of the G9ii.
It all depends on what you can put technically in a body with size limitations.
As far as it looks like atm, it will technically not be possible to put at the same time a mechanical shutter, IBIS, a good EVF and a tilting screen into a body of the size of the S9.
You can of course make a S9x with an EVF bigger, but then the main advantage to use an RF style is gone. Could be still attractive, but size would not be the selling point anymore.
If my assumption is correct, then the only way to have these 4 features in a small body like the S9 or even smaller, is to use a smaller sensor. Either APS-C or MFT.
Since there seems to be no interest of Leica or Panasonic to offer APS-C lenses, I doubt that we would see an L-Mount APS-C body.
At the same time I doubt that Panasonic will leave this very interesting market to Fuji or Sony.
So, the only option for Panasonic would be to bring out a GX10, with the G9ii sensor, with a good EVF, mechanical shutter, IBIS and tilting screen. This would give Fuji and Sony a hard time to beat.
This is why I believe, that there will be sooner or later a successor of the GX9 and why I doubt atm, that there will be ever a kind of S9-sized body with an EVF, mechanical shutter, IBIS and tilting screen.
I hope that I am right on the GX10 and wrong on the S9x, though.
