Nikon show this Z1 mockup

Nikon engineers have shown this new entry level Full Frame Z-mount camera mockup. The engineers said this was one of the early prototype designs made before they decided to go for the current Z6-Z7 design.

They also did show these different shutter button prototypes:

Hard to see any difference :)

Note: This post has been updated with the additional info provided by Mistral (Thanks!).