Nikon press release:
July 25, 2018
TOKYO - Nikon Corporation (Nikon) is pleased to announce the development of a full-frame, Nikon FX-format, mirrorless camera and NIKKOR lenses featuring a new mount.
The mirrorless camera and NIKKOR lenses that are in development have enabled the pursuit of a new dimension in optical performance, with the adoption of a new mount.
https://www.nikonusa.com/en/nikon-products/mirrorless-is-coming.page
Nikon mirrorless system is FF, not MF. they will not repeat Fuji's mistake.
Nikon Z-mount is very wide ... as expected by myself and many others ... to allow for maximum freedom in lens design. Nikon will not repeat their 1957 F-mount mistake and Sony'S FE mount mistake of making it "too darn narrow".
Z-Mount may appear even larger in the available pics than it really is, due to compact size of the camera body shown in teaser/leaked images.
There will be a Nikon OEM adapter for legacy F-mount shards. Will be funny to see how they want to provide backwards functionality for all those older F-shard clunkers with mechanical shenanigans like aperture rings, levers, non EM aperture iris ... and the like. Luckily, Canon EF mount users are be spared from these issues.
Canon will (have to) follow suit soon with a new native mount FF MILC system ... whether all fellow forum members believe it or not. Otherwise: DOOM and CAN-OCALYPSE!
Overall, excellent news. Soon i will be able to choose my future mirrorless FF camera stills system from any of 3 vendors. Plus compact, decent, affordable AF lenses for it from additional vendors like Samyang and other third party makers. I like. A lot!
End of *slap slap, mirror, sub-mirrors, separate AF-sensor, prism, moving mechanical parts, vibrations, noise, AF-MA and similar hassles* is in sight. Finally!