At last Nikon launched this new nteaser video that shows us the silhouette and forms of the new Nikon FF mirrorless. It also seems to have a larger mount than the Sony E-mount:
It’s clear from the teaser that Nikon seems to focus on the lowlight capability of the new Nikon FF system. It’s probably connected with the new “Noct” trademark from Nikon. Probably super fast lenses are coming along this new camera!
Here is the teaser video: