Microsoft has released a preview of 64bit x86 emulation for Windows on ARM.
In this preview, you can install x64 apps from the Microsoft Store or from any other location of your choosing. You can try key x64-only productivity apps like Autodesk Sketchbook, as well as games like Rocket League. Other apps, like Chrome, which run today on ARM64 as 32-bit apps, can run as 64-bit using the new x64 emulation capability. These apps may benefit from having more memory when run as 64-bit emulated apps.
I’m quite interested in trying out Windows on ARM out of sheer curiosity, but since I was one of the few sad sacks who bought a Surface RT on release day, I may sit this one out for a bit.