The new Nikon D850 leaked specifications with information and release dates. To be officially announced on August 15th or 16th at a special press conference in Japan. Most of the info on the Nikon D850 (D810 replacement) can be found below.
3.2inch tilting LCD (2.36 million dot)
9 fps in full frame mode with new MB-D18 grip and EN-EL18a (7 fps without?)
51 continuous shots with 14-bit uncompressed RAW
extra-fine AF point for focus on tiny objects
center AF point sensitive to -4 EV; -3 EV elsewhere (like D5/D500?)
focus bracketing which can be processed by third-party software (not in camera) for infinite DOF on macros and landscapes
.75x viewfinder — bigger than D5 even
AF point coverage expanded to 130% of D810 (30% more coverage)
new 1:1 aspect ratio
new white balance mode — natural light
silent mode/electronic shutter in live view, 6 fps (with locked focus and metering?); resolution 45MP (rather than 45.75MP); 30fps (in DX mode?) and 8MP, for up to 3 seconds
All this is in addition to the specs that were already known or assumed, like D5-type AF, no built-in flash 4K, 8K timelapse, no AA filter, XQD/SD, etc.
Expected retail price of $3600 USA.
You can find the new Nikon D850 here as soon as available.