It looks like I incorrectly assumed the speed of the upcoming RF 24-105mm lens (I should know better). Canon is instead releasing an RF 24-105mm f/4-7.1 IS STM with 0.4x – 0.5x macro through the entire zoom range.
Canon RF 24-105mm f/4-7.1 IS STM:
13 elements in 13 groups
Minimum focusing distance: 0.2m (AF) /0.13m (MF)
Maximum shooting magnification: 0.4x (AF / 105mm) / 0.5x (MF / 24mm)
5 stops of image stabilization
Filter diameter: 67mm
Size: 76.6mm x 88.8mm
We expect this lens to be announced officially very soon.