I wonder if there's more to it that that. Is Microsoft going to re-enter the cell phone market? I'm typing this reply on a 13.3" Lenovo Yoga C630 WOS laptop. Big deal, you say, but it has a Qualcom Snapdragon 845 (ARM) processor running a version of Windows call Windows 10 S Mode. The battery lasts over 20 hours. Really. It has built-in LTE (which is originally why I bought it to replace a failing S3 tablet.)
Aside from it's advantages, it really is a work in process. Windows 10 S Mode to work with an ARM processor has been the main problem. I hadn't seen a BSOD in many years but saw one about once or twice a day when I first purchased this thing. Also, it is a 2-in-1, so it switches from a laptop to tablet when folded over...Initially, when you switched it back would just get confused so a reboot was required.
These problems are slowly being resolved with a continuous stream of system updates from Microsoft and lately this machine has been fairly stable.
Another limitation is that it will only run applications from the special Microsoft S Mode App Store and will not run x64 apps. Full versions of windows are available, my password locker LastPass is, the obscure PredictWind Offshore (a blue water sailing router for low bandwidths) is, but my vpn PIA and many other common apps are not. App availability is hit and miss.
The advantage of all this is you get a (nearly) Windows 10 machine always connected (LTE/WiFi), multi-day battery life and instant on (just like your phone!).
In fact, it IS a phone, running Windows 10, but right now in a laptop form factor. So, I'm wondering if Microsoft plans to re-enter the cell phone market?