Nikon filed a new patent in Japan for a 800mm f/5.6, 600mm f/4 and 400mm f/2.8 super telephoto lenses. The patent was originally submitted on May 30th, 2012. The 800mm f/5.6 lens is already announced and in stock. The current Nikkor 400mm f/2.8G ($8,899) and 600mm f/4G ($9,799) lenses were announced back in 2007 – maybe Nikon is planning to refresh them for the upcoming Winter (or maybe Summer) Olympics?
Via Egami