https://www.cnet.com/news/canon-eos-rp-photos-and-specs-may-have-leaked/

It will supposedly ship in a kit with the RF 24-105mm f4 lens, which makes sense since it's the cheapest RF lens available -- at $1,100 -- though it's possible the rumored 24-240mm f4-6.3 lens (which looks like a far more consumer-oriented, all-around lens) will be the kit lens to keep the price in a reasonable range.   

The back looks the same as the EOS R, albeit possibly with a different viewfinder, since the eye sensor is on the side rather than the bottom.