I'm guessing that Parallels and VMware will be working on this, but it's not going to be an easy process.
Sure I can run an ARM Android or Raspberry Pi emulator on Windows, or an ARM iPhone emulator on a Mac, but doing things the other way round, that's a pretty big deal. I have no doubt that the performance of Apple's ARM chips is going to be impressive, but I don't think it can compete with Intel or AMD offerings at the moment and even when it can, having to emulate x86 is never going to provide the performance that you currently have on Intel based Macs.