I liked the pictures dPreview posted in their first look. Looks good at high ISO under dark/night conditions. The 24-70mm f/4 S-series lens is very compact; dPreview mentioned it was "collapsible"...but I did not see any details regarding that, but again, the 24-70mm f/4 S-series lens is VERY compact,especially compared against the massive 24-70 f/2.8 model for F-mount bodies.
The upcoming 14mm-30mm f/4 S-series lens looked impressive in their photo. Wow...14mm to 30mm in one zoom lens! Those are basically ALL of the wide-angle focal lengths of the past 40 years! From 14mm ultra-wide, to 16mm and 17mm, to 20 and 21mm, and 24mm,25mm, and 28mm, the zoom has eight of the traditional single focal length wide-angle options in it, plus 30mm. Nice!
The dPreview article mentioned that the Z7's viewfinder is so bright and clear that after using it for a few hours, the reviewer found it kind of difficult to go back to the D850's viewfinder. High praise for the eye-level viewfinder system of the Z7.
Although it's early, as in Day One for this newly-announced Z7 model, it appears that Nikon has managed to design a pretty good camera. One card slot? That used to be the norm...the last pro camera I bought with a single card slot was the $5,000 D2x, in May of 2005. I've not had a solid-state memory card fail since 2001. I do not see the single XQD card slot as a deal-breaker, but I'm actually much more-disappointed to see the card format be XQD and not SD. Buuuut...for a camera with 45MP and 9FPS, plus high-definition video, XQD is a very,very fast-writing memory card format.
Looks like Nikon managed to get this camera pretty well-sorted. It'll be interesting to see how it shakes out. The price ($250 adapter only, or $250 less a $100 rebate with camera purchase initially),and features, of the FTZ F-mount to Z-mount lens adapter, pretty surprising.