The next Nikon D850 leaked pictures comes from this dpreview forum discussion (direct link to pictures):
Here is the description in case the images get removed:
The NEF options show on the picture were:
The JPG/TIFF options shown on the second picture were:
The third picture was a side by side comparison between the D850 and the Df (front view).
The fourth picture was also a side by side comparison between the D850 and the Df (side view) - you could clearly see the Wi-Fi and Bluetooth logos above the mic, headphones and HDMI ports. The AF selector had two visible positions: AF and M. The BKT button was in the usual location under the pentaprism.