Here is a quick size comparison of new leaked 5 Canon RF lenses and already released 4 Canon RF lenses.
According to CR, along with new EOS R mirrorless cameras, there will be at least 7 new Canon RF mount lenses coming in 2019. Though some of these lenses may shipping until 2020.
Since Canon EOS R announced before Photokina 2018, there will be no new cameras & lenses to be announced in 2018. We’re now going to see more emphasis from Canon on rebates and deals for the upcoming Black Friday & Cyber Monday and the Christmas shopping season. As in last year, there will be great deals on 5D Mark IV, 6D Mark II, 7D Mark II, 80D, T7i and even on new released EOS R.
Here is another interview with Canon manager at Photokina 2018 by LensVid. They talked a lot about the new Canon EOS R (B&H Photo Video/Amazon/Adorama/Focus Camera/WEX/ParkCamera) and RF lenses. The interesting part is that Canon manager said that they will be focus on RF lenses, so there will no new EF lenses to be released in 2019 (Which means EF 24-70mm f/2.8L IS will coming in 2020), and Canon promised to release the “holy trinity” of RF mount lenses in 2019 (24-70mm, 70-200mm, 16-35mm, likely be f/2.8). Canon also said EOS R is not targeted for pro shooters, a high-end level EOS R Pro mirrorless camera will have a dual card slot, IBIS, fast shooting speed, 4K Video 10bit 4:2:2 internally and more.