Here is the first rumor for 2021 – the Chinese optics manufacturer NiSi is going to announce their first mirrorless lens for Nikon Z-mount in the next few weeks.
Update – back in 2018/2019 NiSi was rumored to introduce a new 75mm f/0.95 mirrorless full-frame lens Nikon Z-mount:
NiSi is mainly known for its filter systems, but they also produce several cinema lenses (I am not sure if the upcoming Z-mount lens will be a cinema lens):
In the US NiSi products are sold at Adorama, Amazon, and B&H.
More third party lenses for Nikon Z-mount can be found here.
