https://www.canonrumors.com/canon-aps-c-shooters-rejoice-sigma-to-launch-the-rf-17-40mm-f-1-8-and-rf-12mm-f-1-4/
Remember those like 5 years where everyone had the 18-35mm f1.8? Seems like this would be the successor.
Full frame is of course dominant now, so this wouldn't be as omnipresent as the 18-35, but could still be a very popular choice, at least if it comes to other mounts too.