If any of us knew where the Japanese made Nikon bins were made, or how stocks compare to the rate at which they are sold, then we might be able to provide some real answers. These sorts of things are better known for camera production, and there have been informed discussions on photography enthusiast sites. Nikon has provided some information itself
http://nikon.com/about/news/2011/0314_01.htm
It seems very likely that the impact on the Nikon Sendai plant's operation will affect availability of its top-end digital SLR cameras (D700, D3s, D3x) and the release of their anticipated replacements (e.g. the D4), and impacts at the Tochigi plant will affect their Japanese made lenses. These issues are especially relevant for the company since Nikon already has a poor track record with photographers for supplying enough of their top-end products to meet demand.
--AP
P.S. I just checked prices for the D700 and they have spiked substantially, almost to suggested retail price. Remarkable for a 3 year old model that is/was about to be replaced.