Quite frankly Linux mint and Cinnamon by extension is X11 software and I dont expect the transition to be completed anytime in the foreseeable future let alone acturally start for users. Even with their incredibly slow adoption of Wayland im shocked they're going this fast, I thought they would wait another several years. Linux Mint is stable software and they're significantly less willing to make any changes than even Debian.

(Btw its just testing atm, nothing exists for users yet)