Since the beginning of the year, reliable rumors about new Nikkor lenses have been lacking. The earthquake in Japan made the situation even worse and now I am hearing that there may not be any new Nikon lenses announced in 2011 at all. Nikon already reported that the factory in Tochigi, which produces lenses, has been "severely damaged".
The D3s and D700 replacements seem to be on schedule for this summer. Some of the Nikon mounts production was moved outside Japan. No word yet on the Nikon mirrorless camera or the D300s replacement.