Amazon UK currently lists the Nikon AF Micro-Nikkor 200mm f/4D IF-ED lens as "discontinued by manufacturer". The lens is also nowhere to be found in stock in the US (B&H, Amazon, Adorama). The 200mm Micro lens replacement has been rumored for a long time and maybe Nikon will finally announce it at Photokina (no reliable information as of today).
Update: here is the full list of Nikon products listed as discontinued on Amazon UK. The Nikon 1 V3 camera, Nikkor 50mm f/1.4G and Nikkor AF-S Micro 60mm f/2.8G ED lenses are also on that list:
The 200mm Micro lens is also listed as discontinued on other Nikon EU stores.