Along with the redesigned iMac, Apple has introduced a new magic Touch ID keyboard for fingerprint authentication, which is useful for quickly connecting to macOS or confirming an Apple Pay online purchase.
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As first noticed by Rene Ritchie and confirmed by MacRumors, the Magic ID Touch keyboard is fully compatible with all M1 Macs, 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 still work, except for Touch ID.
While the new Magic keyboard is compatible with all M1 Macs, 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 made available in the past several accessories exclusively for the iMac, available for purchase separately. For example, when the iMac Pro was released in December 2017, the Space Gray versions of the Magic keyboard, Magic Mouse and Magic Trackpad were only available with the iMac Pro, but became available separately in March 2018.
The new iMac with the new Magic keyboard can be ordered starting April 30 and will be available in the second half of May.