On Weibo you can find the following Nikon Z6III spec list. This is an update specs list which includes info that were not posted before like 1/16.000 shutter speed, 299 AF points, 5.76m dot EVF and PASM dial.
Pixels: 24.5 megapixels
Processor: EXPEED7
Stabilization: 7 stops
Shutter: 1/16,000 sec
AF: 299 points
Video: 12-bit N-RAW recording 6K/60p & 4K/120p
4K H.265 10-bit MOV video, ability to upsample 4K FX to 6K or 4K DX up to 120p.
Burst: Up to 40 frames per second in FX format, 120 frames per second in DX format.
Viewfinder: new high-resolution 5.76 megapixel viewfinder.
Card slot: Supports CFexpress Type B and SD UHS-II cards
Battery: EL-15″ battery
High-Resolution Pixel Shift Photography
Easy-to-use multi-angle LCD screen
Shutter angle fine adjustment options, distinction between project frame rate and shooting frame rate
Support for 2.4/5 GHz WiFi and Bluetooth LE connectivity
USB-C fast charging and HDMI Type-A connectivity
Look inherited from the Z 8, smaller than the Z 8
Micro-logo on top (same as Z 8 and Z 9)
PASM wheel”
Thanks Mistral (via Chassimages)