In addition to the redesigned iMac, Apple introduced a new Magic Keyboard with Touch ID for fingerprint authentication, which is useful for quickly logging into macOS or confirming an Apple Pay purchase online.
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As first noticed by Rene Ritchie and confirmed by MacRumors, the Magic Keyboard with Touch ID is fully compatible with all M1 Macs, including the new iMac, 13-inch MacBook Pro, MacBook Air and Mac mini. When used with Intel-based Macs or other Bluetooth devices, the Magic Keyboard will still work, with the exception of Touch ID.
While the new Magic Keyboard is compatible with all M1 Macs, it will initially only be available with the new iMac. 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 enhanced version with Touch ID and a numeric keypad.
Apple has made a number of accessories that were previously exclusive to the iMac available for separate purchase at a later date in the past. For example, when the iMac Pro launched 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 will be available to order from April 30th and will be available in the second half of May.