Nikon released a new teaser specially about the new mount of the Nikon mirrorless sensor.
It basically just tells us, that the new mount is there to stay for the next 100 years.
The Nikon F-Mount was introduced with the Nikon F in 1959 and therefore already exists (nearly) 60 years. If you think on how the photography changed during this time, it is nearly a masterpiece of engineering to have something so reliable over this time.
We also saw, that the official Nikon page for the new camera lists 4 more teasers to come. As we have 20 more days, we guess we see the next teaser in 5 days. Our guess for the subjects of the teasers: EVF, Grip, Screen(s) and sensor.