At IBC 2019, during the interview with Atomos CEO by Newsshooter, Atomos CEO Jeromy Young said that new AF changes are coming to Nikon Z6 & Z7 full frame mirrorless cameras.
Atomos CEO said at 1:03 of video:
We’re not the only feature they’re upgrading, they have some new autofocus on those cameras
And also this upgrade for Nikon Z6 & Z7 is free, you will just have to pay the cost for sending your camera in.