https://wccftech.com/the-touch-id-magic-keyboard-will-be-a-50-upgrade-for-new-imac-80-if-you-are-going-with-numeric-keypad-version/

We are slowly getting more details regarding the 24-inch iMac and we are going to point the ship towards the Magic Keyboard situation.

Yesterday it was revealed that the new Magic Keyboard with Touch ID will work with every M1 Mac flawlessly. But if you have an Intel Mac, then Touch ID will not work, but the rest of the keyboard will.