Nikon patented two new Fresnel lens designs:

400mm f/5.6 (23cm lenght) and 500mm f/5.6 (28cm length).

Both designed for Full Frame sensors.

via hi-lows-note

This week Nikon published two new patents describing a Canon similar Dual Pixel AF technology and time of flight tech (similar to new Sony sensor). This autofocus system would be used on future mirrorless cameras.

The google translated patent says this:

There is known a time-of-flight (TOF) measurement method for measuring a distance to an object by receiving reflected light of light irradiated to the object (for example, Patent Reference 1). When measuring the distance to the object by such a method, it is difficult to obtain the image of the object at the same time.

It has a set part which sets up the range which detects a focusing state from the information about the exit pupil of the aforementioned imaging optical system, and the information about the aforementioned pixel for focus detection, and a transmission section which transmits the information about the aforementioned range set up by the aforementioned 

Sigma filed a brand new patent which describes a new range of f/1.2 fast prime lenses. This includes 35mm 24mm and 14mm lenses. This is the official Sigma description google translated from the japanese text:

A large diameter ratio lens may use depiction using the shallowness of depth of field as the expression technique in it. Although many interchangeable lenses with a larger F value than F1.4 are provided, in order that they may make depth of field still shallower, an interchangeable lens whose F value is smaller than F1.2 is desired.

Here are the details:

UPDATE: We just learned that while these lenses are indeed for mirrorless system cameras their angle of view suggest they may be compatible with Micro Four Thirds cameras only (and not for APS-C or FF).

Nikon manager Mr. Goto stated in an interview with Xitek that their 2018 mirrorless system camera will use a Full Frame sensor. It will also target professional photographers.