Nikon Netherlands and a few other European sites have a placeholder on their website for a new NIKKOR Z DX 12-28mm f/3.5-5.6 PZ VR lens:
If you click on the “Learn More” button, you will get a blank page with the following URL:
https://www.nikon.nl/en/product/lenses/mirrorless/nikkor-z-dx-12-28mm-f3.5-5.6-pz-vr
A simple Google search shows also that the lens is/was listed also on the Nikon Germany website:
Clearly, Nikon will soon officially announce the 12-28mm DX PZ mirrorless lens. There is no sign of the “rumored” NIKKOR Z 200-600mm lens.
That NIKKOR Z DX 12-28mm f/3.5-5.6 PZ VR lens has been already listed on the latest Nikon Z roadmaps:
Here is the updated Nikon Z lens roadmap as of September 20th (new lenses added)