The German retailer Leistenschneider currently has a pre-order listing for a non-existing (yet) Tamron 150-500mm f/5-6.7 DI III VC VXD lens for Nikon Z-mount:
The price is listed as €1,399, which would be €200 more expensive than the Sony and Fuji versions of the same lens – this may indicate that this is not a glitch or an error. Stay tuned for updates.