The already leaked Tamron 16-30mm f/2.8 Di III VXD G2 lens for Nikon Z and Sony E mount is now officially announced and available for order at B&H Photo.
Additional information on the new lens can be found here:
Tamron 16-30mm f/2.8 Di III VXD G2 lens for Nikon Z-mount officially announced
The new Tamron 16-30mm f/2.8 Di III VXD G2 lens for Nikon Z/Sony E will be priced under €1,000
Tamron to announce a new 16-30mm f/2.8 Di III VXD G2 lens for Nikon Z-mount