Nikon has officially announced the NIKKOR Z 40mm f/2 lens for Z-mount mirrorless camera. The US price for this lens is $299, check pre-order options at B&H Photo Video/Adorama. Release date for this lens is in later this fall.
According to Nokishita, next Nikon Z-mount lens will NIKKOR Z 40mm f/2 lens. This lens will be announced in next few days. The NIKKOR Z 40mm f/2 lens will be a compact prime lens.