Thomas Heaton is well-known in the Nikon community. If I am not mistaken, he was part of the launch campaigns for several Nikon cameras and lenses, including the Z8:
Everyone is preparing for the Nikon Z8 announcement next week
In this latest Instagram story, he is teasing a new “secret” camera:
The speculation is that he is testing the rumored Nikon Z6 III (Canon, Panasonic, and Fujifilm just announced their latest cameras). We will hopefully find out next week. Stay tuned.