Along with upcoming f/2.8 fast zoom RF mount lenses, according to latest rumors, Canon is also working on two new fast prime lenses: RF 24mm f/1.2L USM Lens and RF 85mm f/1.2L Lens. The release date for these two lenses could be in 2019 to 2020.
Canon has already announced the RF 50mm f/1.2L USM lens at EOS R launch day. The rumored RF 24mm f/1.2L USM Lens will be an interesting choice for the RF lens lineup, especially with the speed of the lens. Canon may also release a fast RF 35mm f/1.2L USM lens, because this lens would be more popular. The 85mm f/1.2L for the RF mount would be a no-brainer.