It looks to me that the Canon mount, the way it is designed, it will not be compatible with the FUJI FGX body.... This may be a major factor with respect to the Cambo Actus system (basic & XL) where the Canon EOS electronic mount will allow the FGX grip to recess by the front standard's lens mount...
I believe that many Sony α7 users that use the Sony with a view camera, will consider upgrading to Fuji GFX at some point, yet retaining their line of lenses... Therefore the Canon lens board may be a crucial factor for them to decide on the system to use, as there is limited choice for WA lenses as to use with mirrorless cameras on a bellows camera.