Nikon has posted a bulletin on its Web site on March 14, 2011 to report damage and personnel injuries to factories and workers hit by the Tohoku earthquake in northeastern Japan. They do not know when they can resume operations.
They will likely have global supply problems. Their damaged Sendai factory produced their top D-SLRs including the D3x, D3s and D700.
See the Nikon bulletin here:
http://nikon.com/about/news/2011/0314_01.htm
Hope they get up and running soon.