In this patent application (2024-010559), Canon explores some new designs for macro lenses. With the Canon RF 100mm f/2.8L Macro IS USM, any of the longer focal length designs are unlikely to reach production. There is a 50mm 1:1 Macro that would certainly be useful.
All the Macro lenses shown in the embodiments include image stabilization.
You never know if Canon will decide that a smaller version of the 100mm macro is a good idea, and certainly, there is room for the 50mm in Canon's portfolio.
Canon RF 110mm F4.0 1.0x Macro IS
Focal length 111.29 F number 4.12 Half angle of view (°) 11.00 Image height 21.64 Lens total length 125.00 BF 34.03
Canon RF 90mm F4.0 1.0x Macro IS
Focal length 90.00 F number 4.12 Half angle of view (° ) 13.52 Image height 21.64 Lens total length 120.00 BF 21.58
Canon RF 50mm F4.0 1.0x Macro IS
Focal length 52.00 F number 4.12 Half-angle (°) 22.59 Image height 21.64 Lens length 115.00 BF 24.18
Of course, with any patent application, this is merely research and may never end up in an actual product. We use this to give us an idea about what the clever people at Canon are looking at.
Source: Japan Patent Application 2024-010559