Canon once again talks about the benefits of the bigger diameter RF mount over the older, and smaller lens mounts in the video above.
So why'll we wait for more RF lenses, we can at least learn a bit about them.
From Canon Imagine Plaza:
Canon proudly introduces a new imaging system, the EOS R System, with RF lenses at its core. But what makes these lenses so outstanding? This video introduces the innovative features of RF lenses that open up new possibilities in photographic expression.