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As you know, Canon will introduce the first RF macro lens, the Canon RF 100mmf/2.8L IS USM Macro alongside the RF 400mm f/2.8L IS USM and RF 600mm f/4L IS USM.
The Canon RF 100mm f/2.8L IS USM Macro will feature a new ring called “SA Control” which means you’ll be able to control spherical aberrations in the lens.
Spherical aberration is present when the outer parts of a lens do not bring light rays into the same focus as the central part. Images formed by the lens at large apertures are therefore unsharp but get sharper at smaller apertures.
This new lens will also feature 1.4x magnification, which you can see in this patent. The current EF 100mm f/2.8L IS USM is a 1:1 macro.