Nikon Z30 will be a basic APS-C mirrorless camera with no EVF. On the other hand Nikon Z5 will be an entry-level full frame and position under the Nikon Z6. This camera is the one that will compete against the Canon EOS RP.
The upcoming Nikon cameras for 2020 includes Nikon Z8 pro full frame mirrorless camera, Nikon Z30 APS-C mirrorless camera, and entry-level Nikon Z5. Check out the details of Nikon Z30, Z5 and Nikon Z8 mirrorless cameras.
In addition, both Nikon D880 (D850 replacement) DSLR camera and Nikon Z8 mirrorless camera are rumored to have the same 60MP sensor and similar specifications, just like the Nikon D780 was relative to the Nikon Z6.
Read more Nikon Camera Rumors.
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