Digital camera info has a link to an interview with Canon:
“When I asked these questions to Mr. Tokura, he immediately replied, ``Canon is in a lot of communication with third-party manufacturers regarding RF mount lenses,'' and ``There are no restrictions.'' He quickly denied the speculations that were circulating among photography fans.
"This year marks the 6th year since we introduced the RF system to the world (in September 2018). Our lineup has grown to over 40 lenses. We are thinking about strategies based on our own situation and environment. "I'm working on it," says Mr. Togura. He also said, ``Communication with third-party manufacturers is deeper than it was in the early days,'' and revealed that they are proceeding with more active interactions than before.
When asked when RF mount products will be released from third parties, he declined to give a clear answer, but answered, ``The depth of communication is probably more than half way (toward commercialization).'' ” was the answer. He indicated that negotiations are progressing smoothly.“
Link to google translated interview.