I think its a safe bet Canon will adapt / refresh the 200mm f/2,L 300mm f/2.8L, 500mm f/4L (on the map), as well as the TS-Es (the 24mm is on the map). That's 8.
The roadmap has 10-24mm f/4L & 18-45mm f/4-5.6, I think that fills in the wide end zooms. My bet is Canon will release 3-4 wide L primes, say 10mm, 14mm, 20mm, and 24mm. That's 6.
I had my doubts regarding non-L primes, but the 16mm f/2.8 STM changed my mind. Canon can take the 20mm f/2.8, 24mm f/2.8 IS, 28mm f/2.8 IS, and 35mm f/2 IS, and 50mm f/1.4, refresh for RF, and out the door. That's 5 more. I wouldn't be surprised if the 85mm f/1.8 and 135mm f/2 followed suit, for 2 more.
Then, I doubt Canon would drop the fisheye zoom and MP-E 65mm macro. That's 2 more, for a total of 23.
As for the remaining 9, no bet. If a crop RF camera comes out, Canon might repack a couple of EF-S lenses, say EF-s 10-18mm + 18-55mm + 55-250mm, just so owners would have cheap lenses for the wider-than-white-supertele lenses.