Dpreview interviewed two Nikon managers. They made quite a cryptic statement about possible APS-C mirrorless cameras:
I cannot disclose our plans but for today I can say that since we launched the Z series, our DX format DSLR users have been asking us to apply mirrorless technology to the DX format as well. If we employ APS-C sensors [in mirrorless] maybe the system can be made even smaller. So as we go along, we’ll listen to the voices of our customers.
Sounds like they might use a new mount for APS-C mirrorless?