Canon will release a trio of f/2.8L zoom lenses in 2019 as already confirmed before. They are RF 16-35mm f/2.8L, RF 24-70mm f/2.8L IS, and RF 70-200mm f/2.8L IS lenses. Now according to latest rumors from CR, the wide angle f/2.8L zoom lens will be wider than 16mm.
There are already several lens patents for the wide angle zoom lenses. The most likely to be announced are RF 12-35mm f/2.8L and an RF 14-35mm f/2.8L. Canon also filled RF 14-21mm f/1.4L and RF 12-20mm f/2L lens patents, but these lenses are unlikely coming in 2019.