Lot of chat on the rumor sites and patent details of a new mount,new dual pixel focusing and new lenses,its looking like early this year could see something from Nikon.
https://nikonrumors.com/2018/01/18/a-quick-update-on-the-rumored-nikon-full-frame-mirrorless-camera-z-mount.aspx/
https://nikonrumors.com/2018/01/18/a-quick-update-on-the-rumored-nikon-full-frame-mirrorless-camera-z-mount.aspx/