It seems that Canon is currently working on some “world’s first” type of RF-mount lenses for Canon EOS R and EOS RP mirrorless cameras. According to the report from CanonRumors, a new Canon RF 14-21mm f/1.4L USM lens is currently in advanced development and it will probably come in 2020. This Canon RF 14-21mm f/1.4L lens will be another “world first” type of lenses from Canon just like the amazing RF 28-70mm f/2 L USM.
Several months ago Canon filed a patent for this RF 14-21mm f/1.4L super wide angle RF mount zoom lens.
In addition, the source said that a “crazy” prime RF-mount lens will come next year, but currently the focal length and aperture are still unknown.