The new M1-based Macs can’t run traditional Windows, which requires a computer with an Intel chip, but Windows Insiders can run an ARM-based version not usually available to consumers, and it may be more useful than it might seem.
Apple has published a support document stating that having a Boot Camp partition on a 27-inch iMac (Late 2012) with a 3 TB hard drive prevents macOS 10.14 Mojave from installing. Read on for workarounds.