According to a leaked page that is allegedly from a Nikon camera manual is “confirming” that Nikon 60MP full-frame mirrorless camera in the works and it will be able to shoot 16-bit NEF raw files. Possible candidate for this sensor is the Nikon Z8.

The manual page is identical to similar pages in the Nikon Z7 user’s manual. The main differences are the increase in resolution to 9552 x 6364 (just over 60MP total) and the addition of 16-bit NEF to the RAW section.
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https://www.dailycameranews.com/2019/09/nikon-z8-camera-rumored-to-feature-60mp-sensor-with-16-bit-raw-files/