Latest update on rumored Nikon D850 specs:
https://nikonrumors.com/2017/08/12/nikon-d850-specifications-recap.aspx/#more-114705
45.75MP full frame CMOS sensor
New and improved version of SnapBridge
No built-in GPS
Tiltable LCD (3.2", 2.36 million dots)
Fully functional touchscreen: supports touch AF, touch shutter and touch menu
Memory card slots: one SD and one XQD
AF system from the D5 (153 points, 130% frame coverage compared to the D810, all AF points @ -3EV, middle/center crosshair sensor @-4EV)
New smaller AF point
No built-in flash
Back illuminated buttons
Joystick selector
Built-in Bluetooth and Wi-Fi
8K time-lapse video capabilities
4k UHD video in FX format (with no crop)
No EVF or hybrid viewfinder
Slo-mo full HD 120fps video
The SD slot will support UHS-II
Improved LiveView split-screen display
Improved silent shooting mode: fully-silent, no-sound electronic shutter in live view (no mechanical movement, can shoot up to 30fps @ 8MP with the electronic shutter)
Improved battery life
Lighter than the D810
Native ISO range: 64-25,600
ISO 64 extendable down to ISO 32 (Lo1 = 32, Hi 2 = 108,400)
7fps without grip, 9fps with grip (MB-D18a battery grip)
51 images raw buffer at 14-bit RAW
0.75x optical viewfinder (largest ever on a Nikon FX cameras)
180k RGB meter
No AA filter
Supports for Nikon wireless trigger WT-7
Fully-silent, no-sound electronic shutter in live view (6 fps silent shooting)
Built-in focus stacking: up to 300 pictures with up to 10 levels of focusing steps (still need external software)
Price will be CNY 23,999 or around $3,600 (source: Chinese forum)
Announcement date could be August 16th
RAW sizes: small, medium, large
New 1:1 mode
New natural light AWB
Not bad, but is it enough to get D800 and D810 owners to upgrade? I probably won't get it. $3,600 is a bit much.