It looks like Nikon's next announcement will be for new supertelephoto lenses. Expect to see the announcements some time in July/August of this year.
- Nikkor AF-S 500mm f/4E FL ED VR
- Nikkor AF-S 600mm f/4E FL ED VR
The new lenses will get a flourite element (FL) as well as a weight reduction, improved VR and a price bump to match.