Nikon filed a patent (201048125) in Japan for a 135mm f/1.8 lens:
- Patent release date: March 8, 2012
- Patent filing date: August 30, 2012
- Focal length: 132.9mm
- Aperture: 1.8
- Angle of view: 18.3°
- Lens design: 15 elements in 9 group, 2 ED elements
- Internal focusing (IF)
- Vibration reduction (VR)
Update: here is the US patent 20120050872 application for the same lens.
Nikon currently has the AF DC-Nikkor 135mm f/2D lens ($1,329.00) in their catalog (lens design: 7 elements in 6 groups).
It seems that Nikon is persistently releasing a whole line of full frame f/1.8 lenses – last year there was the Nikkor AF-S 50mm f/1.8G lens, this year the Nikkor 85mm f/1.8G and will probably see also a new Nikkor AF-S 28mm f/1.8G by the end of 2012.
