Nikon Service Dresden already lists the Z6III and Z7III cameras on Google search results in Germany:
Of course, this could be a typo.
Update – here is the response I got from Nikon Service Center Dresden:
In fact we were actually surprised by our own Google entry and are still investigating how this occurred. Typos can never be entirely ruled out. What we have discovered is that keywords such as “Nikon Z6III” are very popular on Google, and the search queries are on the rise. We have several Google Ads running that automatically pick up certain keywords when a search term matches our company profile. Google processes these and adds these keywords to our search results. In our Google Ads account, these keywords have now been marked as “exclude” and should hopefully no longer appear in the search results. Nikon does not share information with us about upcoming releases.
We are truly sorry for any anticipation this may have caused among Nikon fans and sincerely apologize for any confusion.