- New 46MP FX Format sensor
- AF system same as Nikon D5
- 4K Videos
- full HD 120fps video
- Tiltable LCD touchscreen
- Improved dynamic range
- Continuous shooting speed upto 8fps
- Improved low-light performace
- New and improved version of SnapBridge
- No built-in GPS
- Memory card slots: one SD and one XQD
- Back illuminated buttons
- Joystick selector
- Built-in Bluetooth and Wi-Fi
- 8K time-lapse video capabilities
- The D850 will be on display at the Photo+ Expo in October
- No EVF or hybrid viewfinder
- D850 LCD will have twice the resolution of the D810
- SD slot will support UHS-II
- Improved LiveView split-screen display
- Improved silent shooting mode
- Better battery life
- lighter than the D810

The camera shipping of the camera will start from October and we can expect its official announcement on September 2017.

http://thenewcamera.com/nikon-d850-full-specification-leaked/