Nikon today announced that the Z6 II and Z7 II will receive a 1.10 firmware update on February 25th. The primary improvement on both cameras is "improved Eye AF." The exact difference is that smaller eyes are detected and better pupil detection was added. Both cameras get support for Blackmagic RAW with the Blackmagic Design Video Assist 7 recorder. ProRes RAW support gets additional EXIF information that is picked up by Final Cut Pro (e.g. White Balance). As usual, the RAW support options require that the camera have been upgraded by the paid firmware service by Nikon. Finally, the Z6 II also gets native 4K UHD/60P support (with DX crop), as promised when the camera was announced.
The firmware can be downloaded through Nikon's Download Center, but not until February 25th.