B&H has now listed the price of the latest Zeiss Otus 28mm f/1.4 ZF.2 lens for Nikon F mount: $4,990. For comparison, the 55mm Otus is $3,990 while the 85mm Otus is $4,490.
Additional information on the Zeiss Otus 28mm f/1.4 ZF.2 lens can be found here. The expected shipping date is February, 2016.