The rumours that we have been hearing about for months have been true and Nikon announced two new mirrorless full frame camera bodies. A new line of S-mount lenses will be shipping as well (three to start) and more coming over the next couple of years. A relatively inexpensive adapter will let enable existing F-mount lenses to be used with these cameras. 6 more lenses will start shipping in 2019 and 3 more in 2020.
https://petapixel.com/2018/08/22/nik...camera-system/
https://www.nikonusa.com/en/index.page
They appear to have done something right and will be releasing a body that seems to beat the D850's performance in some regards. I'm looking forward to the first reviews when the $US 3,400, 45.7 MP Z7 ships in just over one month. The less expensive $US 2000, 24.5 MP Z6 will start shipping in November 2018.