I'll get one of these and run Linux, but ARM Windows is already available.

I'm on an m1 and have ARM windows for playing ck3 in parallels. Runs way better in that then natively.

I couldn't tell you where I got it or what its version is called but it was easy to find IIRC. Official too.

That already exists and has for years. Surface Pro X launched in 2019 with Windows 10 on ARM, Windows 11 on ARM is a thing. x86/x64 apps work through a compatibility layer. You can get an ARM Surface Pro 9 today or something like a Thinkpad X13s Snapdragon.

Really all that's needed is a fast enough, efficient enough CPU that makes it make sense for the price/performance ratio. I bought a refurb'd Surface Pro X for $400 CAD, for that price it's amazing. For the full MSRP? I don't think so...

Windows 10 and 11 support Arm64, but their Server counterparts don't. Microsoft has also been reaching out to application developers, asking them to add Arm64 support. I think we're going to see a major shift to Arm64 in the Windows world in the near future.