What might the Z6 II and Z7 II tell us about future pro Nikon mirrorless models?

The Nikon Z6 II and Z7 II are solid updates to the original Z6 and Z7 but neither represents a 'new' concept in the Z-series lineup. With the Z6 II and Z7 II, Nikon has modernized its high-end Z-series full-frame lineup, and made its offerings more competitive against midrange and high-end ILCs from Canon, Panasonic and Sony. But while the Z7 II is the nominal flagship, it's clearly not a 'professional' model in the same sense as the D6 and (arguably) the D850. While new to the market, neither M...