I copied this from somewhere that I can't link to on here. Take it for whats its worth, a rumor.
Fujifilm X-T3
Do you like Full Frame? Do you prefer APS-C? Is X-Trans your thing or do you want a Bayer sensor? Or maybe you always dreamed of a monochrome sensor?
Don’t worry, to get all of this, you will need just one camera, the
Fujifilm X-T3.
Our top trusted Japanese source just told us that the Fujifilm X-T3 will have an interchangeable lens/processor/sensor.
The concept is similar to the one used by the
Ricoh GXR/S10, where basically lens, sensor and processor will be integrated into 1 single unit, that you can switch how you prefer.
Our trusted source told us, that at the
Fujifilm X-T3 launch in September 2018, the Fujifilm X-T3 will be offered with:
- 24MP APS-C X-Trans sensor
- New X-Trans sensor with less than 30MP
- 24MP BSI Bayer Full Frame sensor of Sony A7III
- Monochrome 24MP Full Frame Sensor of Leica M Monochrom
- organic APS-C sensor with global shutter
Along with the Fujifilm X-T3, Fujifilm will also launch the first two Full Frame lenses:
- XFF 35mm F1.8
- XFF 70-200mm F2.8
I asked our Japanese source if it will have also the option of a Medium Format sensor, but the source said MF sensor would make the Fujifilm X-T3 chassis too big, and Fujifilm wants to keep it smaller than the X-H1.
Fuji’s idea is to offer a Fujifilm X-T3, where you guys can still perfectly use all your current APS-C lenses, but if you want, you can slowly transition to full frame and finally spend more money on bigger FF glass.
The source also told us, that the new system is the real reason, why the
Fujifilm X-T3 will not have IBIS: it is just technically too complicated at the moment to make an interchangeable sensor system with IBIS incorporated.