https://wccftech.com/surface-phone-arm-folding-device-windows-10-sdk/

A lot of Microsoft patents about a folding device which apparently runs Andromeda OS, a special version of its Windows 10, have been spotted since last year. The patents describe a tablet that can be folded into a handset. Many have speculated that this folding device is the upcoming Microsoft Surface Phone and from the looks of it, the upcoming device might be running an ARM SoC.

Inside the latest Windows 10 SDK, there is code that references to the Andromeda OS. The code was discovered by WalkingCat, who often leaks Windows-related information. Before this, WalkingCat had discovered a list of smartphone apps hidden on the Windows Store that are related to the Andromeda OS. Apparently, Andromeda OS will support ARM as well as x86 CPUs. However, the actual product will be fueled by ARM chips.