Not sure how reliable this info is. But a source at Xitek claimed this:

“Just spoken to a franchise director at LCE, apparently Thursday will be a very exciting day indeed.
The adapter for the new mirrorless camera will pretty much be free when bought with either model, and the adaptor will make upto 400 lenses compatible so that’ll make all lenses with either electronic or mechanical apertures compatible.
The sensor will be better than the D850 owing to how they’ve constructed the diodes and the way it’s capturing more light, and the new range of lenses will have fresnel elements to give an ‘effective’ larger aperture (so I was told a 1.8 Will be marketed as 1.8 but behaves like a 1.4, and be tiny) much like their new 300mm that shrunk.
Pre orders coming Thursday to ship mid November”
Just chatting with the LCE branch manager, he said that obviously Thursday will be a very exciting day.

The German website Cameracreativ.de posted these mount size comparisons based on the rumored Z-mount size. On August 23 we will finally get the definitive and real Nikon Z specs. Stay tuned!

We received the first leaked image of the new Samyang AF 14mn f/2.8 for Nikon F. This is Samyang’s first autofocus lens for Nikon. And I hope this means they will also make a Z-mount version too!

The image on top shows the Nikon patented optical desing of the 52mm f/0.9 lens (Source: Hi-Lows-Note). It’s very likely the 58mm f/0,95 will have nearly the same design. This is a highly complex design and for sure it’s going to be a very BIG and expensive lens. But still…very exciting and unique! The currently fastest autofocus lens is the Canon 50mm f/1.2.

Im Büro: „Lecker – möchte jemand ein Stück Pressemitteilung?“ #Nikon #NikonZ6 #NikonZ7 pic.twitter.com/yzftmK4Qhb

— Sebastian Trepesch (@Trepesch) 14. August 2018

Nikon will have another press conference on September 25. it might be that they will NOT announce a new product but rather share more details about their new Nikon Z system.

There is a new rumor listing the possible new Nikon gear:

On August 23 Nikon will announce this:
Nikon Z6: high speed, low light model (24MP)
Nikon Z7: high-resolution model (45MP)
Z-Nikkor 24-70mm f/4
Z-Nikkor 50mm f/1.8
Z-Nikkor 35mm f/1.8

A couple of months later Nikon will releases this:
Z-Noct-Nikkor 58mm f/0.95

Particularly the Nikkor 58mm f/0,95 lens will have a great wow factor necessary for Nikon to create big attention on the system The big question is…what will be the price of it?

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via Nikonrumors