A newly published patent discloses the design of a professional Nikon Z camera with built-in grip. In the images below you see the size comparison with the current Nikon Z cameras (images with dark grey body):
I guess this could be the future Nikon Z9. A bigger body would allow better heat dissipation for professional video recording and also faster frame rate.
From what I heard so far the Nikon Z9 will be released in 2020 and use a new fast Sony sensor. It will compete against the Sony A9.
UPDATE: Answer to a troll competition site :)
Some composition website claimed these images are from him and that I watermarked them afterwards. Two proofs this is not the case:
1) He posted 10 images and I posted 12 images. So where the heck did I copy the two more images if he didn’t post them? Example image he did not post is here.
2) The second proof is that my source posted these images 11 days before his post! Here is the screenshot of the source. I will not share the link as he might stop posting if companies will find it out and contact him!
Oh yes and the source is legit because they have a famous track on patents and REAL image leaks. I gave the link to the source to some of our long time trusted commenters so that they can be testimony that the source is SUPER real ;)
Gosh, I probably wasted 30 minutes of my life answering a troll :)