Here is the specifications comparison of the Nikon Z6 vs Nikon Z7 vs Nikon D850cameras. According to recent reports, first set of Nikon Z6 and Nikon Z7 full frame mirrorless cameras specs now available.

The Nikon Z6 full frame mirrorless camera will be a 24MP resolution model with high speed and low light performance. The Nikon Z7 will have the same high-resolution full-frame sensor as the D850 and come with 45MP resolution.
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https://www.dailycameranews.com/2018/08/nikon-z6-vs-nikon-z7-vs-nikon-d850-specifications-comparison/