[Brightcolours]

Fuji only caters for a very small number of photographers with their current small body APS-C line up. They will have to start from scratch a 2nd time if they want to get a piece of the pie of the FF "mirrorless" market. Both Sony (E/FE) and Leica (T/S) made sure the mount leaves enough room for FF. The Canon EF-M mount is the same size as the Sony E-mount (and coincidently Nikon F-mount).

 

http://camerasize.com/compact/#624,520,351,ha,f

 

Notice the smaller mount compared to Sony E-mount.