Nikon today has officially announced the Nikon Z6 availability and Black Friday & Cyber Monday deals for 2018. Nikon Z6 will be released in US on November 16th, 2018, you can pre-order online at B&H Photo/Adorama/Amazon. The Nikon Black Friday deals are same as leaked yesterday, you can see full list of Nikon Black Friday deals here.
The Nikon D850 will be officially announced on August 24. Here are first leaked press photos, press release already available online. According to leaked press release, Nikon D850 featured with a new 45.7 full frame sensor without AA filter, 7 fps or 9 fps with battery pack, ISO expandable from 32 to 102,400, 153 AF points, 4K video at 30p, weather sealed for all conditions, supoort UHS-II SD card and XQD card. You can also take a look at full leaked specs here.