According to latest rumors, after the first RF mount f/2 zoom lens: RF 28-70mm f/2 USM lens. Canon currently is also working on another RF mount f/2 zoom lens. Though specs and release date info is not available yet. Stay tuned.
Rumors said Canon is developing a “second holy trinity” of lenses for the RF mount, so this lens could be either a wide-angle zoom lens or a telephoto zoom lens. The current “holy trinity” is generally accepted to be the RF 15-35mm f/2.8L IS, RF 24-70mm f/2.8L IS and RF 70-200mm f/2.8L IS.