Boom! 
Like them or not, and I think they are OK, this is going to hit Nikon, because they are v popular. 1M+ subscribers.

Even in the short time they had use of the camera they seem to have got a lot done with regards to testing. Does make you think how others at some of these events have been so positive.

I doubt they will be at the top of lists for future Nikon events.
DPReview also put up a slightly more critical
'Z7 First Impressions Review'.
I think the niggles are starting to get around, and the one card slot is always mentioned.

There is lots of talk of pre-production, but then if it is not very close to how it will be for users don't show it to the media.

There is also talk of fixing things in Firmware updates, but that is not something Nikon is known for, so to suddenly get as active as some other manufacturers have been may be a tad optimistic. Time will tell. Obviously some hardware things will not be able to be fixed with a Firmware update. The targets were the a7III and the a7RIII but these camera seem to be around the level between versions 1+2 of those cameras from all the 'hands on' reports so far. They seriously need to get these camera better before the in depth reviews start to be done if that is possible.