Nikonrumors is saying they have a reliable source that says the Nikon 200-400mm VR is going to be replaced in a few weeks. Look for the latest VRII in the new lens and a few other tweaks. Apparently the existing lens is no longer available out of Japan either.
Originally introduced in 2003, it’s due for an update, so no real surprise there. Kinda’ following up on the recent update to the 70-200mm f2.8 VR.
This lens is more of a specialty lens. Your average shooter doesn’t own this lens, but a lot of bird shooters do. None the less, it’s an excellent optic. I expect the new version to be even better than the existing one, which is superb.