Canon is one of the few that is looking at improving image stablization with macro lenses.
Because macro lenses need to be stablized in different directions, including tilt, it's a entirely different set of circumstances to get a close to 1:1 macro to be stablized well.
Canon's HIS is such a stablization, and in this patent it appears they are looking to make it better.
US Patent Application 2018-0041705
Describes improvement of image shake correction including with better tilt correction. Interestingly, this applicatoin show a lens that is similar to a 50mm in it's design. A 50mm IS macro is most certainly missing from Canon's lens lineup.
Via NorthLight .. thanks