rf 120-600mm

I would really like Canon to make a big brother for the RF 100-500mm. By using the "same" design with 105mm filter / glass size they could probably make the following: 120-600mm f/4 - f/6,3 (actually ~f/6,1 which they could for marketing purposes call f/5,6 when using 1/2 stop increments) f/4,0...