To actually answer your question...
There is already an ARM version of Windows 10 used on a very few ARM-based PCs like the MS Surface X.
There are a few technical question marks over whether it would work on Apple Silicon (which is Apple's customised version of ARM) - and if it did, whether its x86-32 emulator/translator would work on the strictly 64-bit Mac - but unless anybody here (a) works for Apple or Microsoft and (b) wants to get fired for leaking information, we just don't know.
Apple have clearly said that they won't be supporting direct booting of other OSs, so things like Linux will run under Parallels etc. (which they've shown working on Apple silicon) and since any official solution will require co-operation between MS and Apple you're unlikely to see any viable unofficial solution.
Remember that Bootcamp was only viable because once Macs switched to Intel they adopted the industry-standard x86 PC architecture (which goes beyond just having an x86 CPU) and mostlyu sed regular PC components from Intel, AMD, Broadcomm etc. for graphics, networking, audio etc. They were a gnats whisker away from being able to run a standard copy of Windows out-of-the-box (some Macs literally could, at least with Windows XP) and "hackers" had Windows up and running (by simply restoring a missing UFI firmware module that Apple left out of the first Intel Macs) before Apple even introduced Bootcamp - which was little more than a click'n'drool "wizard" to work around some Windows installer shenanigans and download a bunch of (mostly third-party) hardware drivers. The switch to T2 chips as disc controllers added a slight complication, but Intel Macs were still mostly PCs.
Apple Silicon Macs - although we don't know the details yet - are likely to be a completely proprietary architecture in which most of the components (graphics, disc controller, USB, sound, networking) are part of the Apple Silicon system-on-a-chip and designed to work with Mac OS subsystems like Metal, Core Audio etc. and even an OS built for ARM will need a number of Apple Silicon-specific drivers if they're going to direct boot, which won't happen without Apple support. In virtualisation (Parallels etc.) they can use "paravirtualised" drivers which connect with Parellels (or whatever) which in turn calls the MacOS drivers - which is helpful to Apple because they don't have to maintain a "standard" hardware interface between releases of Apple Silicon if the only drivers that matter are in MacOS.
I think it is quite likely that MS will work with Apple (and maybe a third party such as Parallels) to make a virtualised version of Win10 for ARM available - if MS are serious about their ARM support, they'll be aware that ASi Macs will outnumber Surface Xs pretty much overnight. However, that leaves the question of how much use Win10 on ARM will be to you if the Windows apps you rely on are old x86 apps which - at best - will only run under Win10's equivalent of Rosetta (which probably isn't as good) - and whereas we can be pretty confident that all the "going concern" Mac apps will be ARM native within a couple of years, the Windows world is still joined at the hip with x86, which isn't likely to change anytime soon.
I'm sure that there will also be an option to run x86 Windows under emulation - considering that a (non App-store friendly) solution already exists on iOS where it makes much less sense - but that isn't going to be very fast.
