The Nikon D850 looks to be even better then the D810 at reducing noise at High ISO's. This will be incredible for those who shoot a lot in the dark. Shooting concerts, weddings, the Milky Way and so much more, will now look so much better.
Look at these results that Bill Claff has provided...
There is an issue with Uploading Photos (attachjments). I am not sure what the problem is, and I am looking into it. You can still try to Create your Threads and Upload your Photos, but it is hanging up during the Upload.