About new Nikon Z6 & Z7 FF mirrorless cameras annonced

Photography is a passion since 35 years. I own a large brunch of digital Nikon professionnal cameras. I started at the end of 2003 with D70 and my last one is a D850. The good point for that manufacturer was, front of competitors, the lenses compatibility.  The NIkon F mount is preserved since 1959 ! Even sometimes you loose automatisme, you may mount an old lense on  recent body and that 's what i called investment. The amount of money photographers spend into lenses is much more important rather than the one for the bodies. Another key point is generally that the lenses do not wear out ...
The bad news here is that Nikon decided to create a new mount system : the Z mount. Nikon will propose an adaptor to mount "old" F lenses onto Z mount but you will have to reinvest to get the better of the system.

Another (and very bad) point is that the memory slot is XQD, a rare and expensive form factor. I don't understand why there is not a second SD UHS II slot  like Sony and Fujifilm does.

Backlighting commands, very valuable in dark places, disappears too.

Regarding burst mode performances, i don't understand why Nikon with its 24 Mpixel sensor is not able to be at the level of Sony and the futur Fuji XT 3 with 20 images /s, very useful in sport.

So wait and see ...