Today Tokina announced a new SZ 500mm f/8 Reflex MF super-tele lens for Nikon F and Z mounts (connected via an adapter, pre-orders coming soon at B&H):
Additional information can be found here:
Tokina recently also announce a new Tokina SZ 400mm f/8 Reflex lens for Nikon F and Z mounts:
The Tokina SZX 400mm f/8 reflex lens is now compatible also with Nikon Z mount