Anything you dual boot with has to support Secure Boot, UEFI and TPM. It is most likely a non-starter for most dual boot scenarios.
Many of the dual boot questions that come up here and elsewhere are older and require non-UEFI, and disabled Secure boot which are not going to work with Windows 11
It is still new at this point, but I expect stiff requirements will remain. That is to say, anything that does not support Windows 11 basic requirements (Secure Boot and UEFI) will not work. That means a number of current setups with looser requirements will not work in Windows 11.
Virtual Machines will be a much more likely way to run multiple machines with Windows 11.
