Along with the redesigned iMac, Apple introduced a new Magic Keyboard with Touch ID for fingerprint authentication, which is useful for logging in quickly to macOS or confirming an Apple Pay purchase online.
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How first pointed out by Rene Ritchie and confirmed by MacRumors, the magic keyboard with Touch ID is fully compatible with all Mac M1s, including the new iMac, 13-inch MacBook Pro, MacBook Air and Mac mini. If used with Intel-based Macs or other Bluetooth devices, the magic keyboard will continue to work except for Touch ID.
While the new magic keyboard is compatible with all Mac M1s, it will only be available with the new iMac, at least initially. The new iMac can be configured with one of three different Magic keyboards, including a standard version with Touch ID, a standard version without Touch ID, and an extended version with Touch ID and a numeric keypad.
Apple has put on sale some exclusive iMac accessories previously available to buy separately later. When the iMac Pro was released in December 2017, for example, the space gray versions of the Magic Keyboard, Magic Mouse, and Magic Trackpad were only available with the iMac Pro, but were available separately in March of 2017. 2018.
The new iMac with the new magic keyboard can be ordered from April 30 and will be available in the second half of May.