Nikon already stated that they will no longer provide a roadmap for any future lenses. After the Nikkor Z 600mm f/6.3 VR S announcement, Nikon updated the roadmap with the new lens – the only lens left to be released is the Nikkor Z 35mm f/1.2 S:
Nikkor Z 600mm f/6.3 VR S PF lens pre-order links:
Nikon will no longer provide a roadmap for the development of future lenses