Here’s the roadmap for the Nikon Z lenses that is made in rumors or previously mentioned for 2019. We already know that Nikon has serious plans for the next three years of Z-mount lenses.

According to the official Z-mount lens roadmap published in late 2018, Nikon is planning on hitting most of the other standard focal lengths in 2019, including 85mm, 24-70mm and 70-200mm Z lenses. The company will release six lenses in 2019, six more in 2020 and eight in 2021. This will make the lineup a total of 20 lenses for Nikon Z-system.
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https://www.dailycameranews.com/2019/01/rumored-nikon-z-mount-lens-roadmap-for-2019/