There has been rumored for a long time that Canon is going to announce EF 24-70mm f/2.8L IS USM lens. Now, since EOS R mirrorless system announced, it seems that a new RF 24-70mm f/2.8L IS USM lens will be announced next year, also RF 70-200mm f/2.8L IS USM Lens.
Canon has already announced 4 RF lenses now: They are RF 28-70mm f/2L, RF 24-105mm f/4L IS, RF 50mm f/1.2L, RF 35mm f/1.8 Macro IS STM. And there are already two RF lens patents: RF 24-70mm f/2.8L IS, RF 24-300mm f/4-5.6L IS. Canon already mentioned in their announcement video that they are working on “a series of fast f/2.8 lenses and more”. Which means we may see these new f/2.8 zoom lenses in 2019 to 2020.