What would be the point of not using the EF-M optical formulas? Just a way for Canon to waste their money on totally new optical formulas and retooling their production lines? Nice. They could start from scratch, but it would be foolish. There's only a 2mm difference between the flange distance of RF and EF-M. Other than the lens mount, that's the only difference. If Canon
wanted to have an immediate crop RF set of lenses, they could easily do it with existing EF-M optical formulas. But then again, maybe Canon arrogance will have them starting from scratch and making users wait years for crop RF lenses to trickle out

I wouldn't put it past Canon to do that!