Microsoft didn't want to spook Intel too hard, that, and they wanted to motivate developers to buy into the sandbox "Store App" environment. So long as Win32 wo

Microsoft didn't want to spook Intel too hard, that, and they wanted to motivate developers to buy into the sandbox "Store App" environment. So long as Win32 worked, why bother putting effort into designing an app specifically for Windows RT/8? There's another reason for Microsoft to allow full ARM development with the NT OS: Windows CE is dead, and I believe many IOT/Embedded shops might be too put off with other embedded systems - and/or don't want to rewrite their ATM UIs or Factory robot arm controllers (both historically the realm of WinCE) as Android apps or "Windows IOT" UWP apps. So saying "Windows 10 now also replaces Windows CE" is a good thing, especially given the relative ease of porting Win32/CE code to the full-fat Win32/NT implementation. I think this will only be news if we hear them announce unlocked ARM for all phones and tablets. It's still possible unlocked ARM is entirely up to the discretion of the OEM, not the user.