[Brightcolours]

I doubt Canon will announce a mirrorless FF body, as their M-series mount is too narrow for FF. At least they said so themselves. 

The mount diameter of Sony NEX is the same (tiny bit smaller). That explains why Sony needed a different mount for FF mirrorless....  :ph34r:

I have not read anywhere Canon stating what you state above?

 

The numbers: Fuji X-mount diameter: 44mm. Nikon F-mount diameter: 44mm (bigger flange distance). Leica M39 diameter: obviously smaller than 39mm diameter (bigger flange distance), Leica M mount diameter 44mm (bigger flange distance). 46.1mm for Sony E mount. 47mm for Canon EOS M mount (54mm for EOS (bigger flange distance)).

 

That said, both the Nikon F-mount and the Sony E mount are rather narrow and kinda limiting for large apertures.