In an interview with Photolari Sony engineers and managers confirmed that they do have all the capability required to build a mirrorless medium format camera
It has been ruled out the possibility of launch a medium format camera. At least for now.
And is that the spokespersons of the company have ensured that they have the necessary technology and components and that, if they decide to bet on this market, they could produce a medium format camera.
Yes they do have all the capability but they are putting attention of Sony A7/A9 series cameras. BTW, the image quality of Sony Fullframe sensors aren’t too behind from Medium Format cameras. Take a look at Sony A7R II and 645Z comparison
Take a look at the Latest Sony Rumors here
Medium format cameras suffer from immature sensor/ram/processor technology and most importantly, lens that cannot be compared with fast FF lens. Take a look at Fuji’s lens MF lineup:
45mm/f2.8
110mm/f2
23mm/f4
32-64mm/f4
63mm/f2.8
120mm/f4
So the fastest prime (110mm/f2) is something like a 85mm/1.56.
You can buy f1.4 1.2 or even 0.95 lens on a FF body with a fracton of the cost of MF lens, less weight, faster speed etc. Even for studio work (that requires maximum DR), MF cameras doesn’t make a real difference today.