With an official announcement for the D850 coming likely tomorrow, the press release was leaked earlier to Nikon Rumors. Between that and specs leaked earlier, the D850 is looking quite sweet as the successor to the D810. The Big Takeaway has to be the 45.7 MP full-frame sensor as a nice upgrade from the previous D810's 36.3 MP. All unofficial specs for now but with the source of the info it's looking likely and we'll find out soon anyway.Other Interesting Specs:

• 9 FPS Continuous Shooting - 7fps without the battery grip, 9fps with grip, using a 51 shot RAW buffer.
• Fast Auto Focus - 153 points! Brought down from the D5, this super fast AF will work great in low light up to -4EV using the center focus points.
• Tilting Touchscreen - A tilt screen is a life saver, and a back saver as well for getting low to the ground shots, it makes a big improvement for shooting. It supports full touch controls with touch AF, touch shutter and touch menu making reviewing photos or changing settings a breeze.
• 4K Video - 4K UHD video in FX (no crop) and slow-mo video at 120fps in Full HD.
• Silent Shooting Mode - No-sound electronic shutter for live view. 6 FPS silent shooting up to 30fps at 8MP with the electronic shutter.
• "On-Camera" Focus-Stacking Mode - A great option for macro lovers, the first to offer an option for in-camera focus stacking. Moving the focus slightly between shots to increase depth of field.

Press release via Nikon Rumors:

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August 24, 2017 - Nikon is pleased to present the new Nikon D850 digital SLR, perfect combination of resolution, speed and light sensitivity. From studio photography to sports, to reportage in the most remote places on the planet, the new full-frame DSLR in Nikon FX format not only delivers high performance, but brings photo excellence to a whole new level.Whether it's naturalistic, sporting, commercial, wedding, fashion photography, whether it's shooting movies, the D850 offers photographers who work in highly competitive fields the creative flexibility needed to excel. The fast, 45.7-megapixel FX high-resolution FX sensor is built with the "gapless on-chip" microlent technology that, together with the benefits of CMOS backlight, delivers exceptional detail sharpness along with an incredible dynamic range. The shooting speed of 7 fps can go up to 9 fps by adopting the optional MB-D18 multi power battery pack. Video-makers can then record full-size movies in 4K without clipping factor crops: this increases the chances when looking for extended field corners to resume with NIKKOR prime lens lenses. Additionally, you can record timelapse of 4K accelerated movies directly on "camera".The other new features that allow maximum flexibility include capturing RAW format in three different sizes: large, medium or small; The silent Photography mode, which makes it possible to shoot ultra-sharp, high-resolution images without the sound / mechanical shutter noise; The AF Pinpoint mode, available in Live View, allows you to make the auto focus more accurate and selective as required, for example, in the case of macro photography.In addition, the Nikon D850 is the first digital reflex of all time to offer "on-camera" focus-stacking mode, which allows you to shoot a series of shots sequentially of the same shot but with the focus plane Motorized in displacement. This mode is particularly useful in macro photography, when the close distance of the subject narrows the depth of field to a few millimeters but also for artistic representations of naturalistic scenarios to enhance the extreme depth of field.Nikon says: "The D850 offers such incredible versatility to give you the impression of working with three cameras in one. Megapixels, file size, speed, ISO ... in every field, you can be assured that the Nikon D850 excels! It's a really smart investment for photographers who want to enhance their skills and express themselves without compromise. " Full Rumored Specs via Nikon Rumors:

• 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 (6 fps silent shooting, 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 and the EN-EL18a battery)
• 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 transmitter WT-7
• 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)
• RAW sizes: small, medium, large
• New 1:1 mode
• New natural light AWB