Latest news are that we can use Harbour from a WinRT app, but as a scripting engine. In other words:
building a WinRT is such a complex task (same as building an app for iOS, or for Android) that the easiest way to go is to use Microsoft development tools (Visual studio) and then link Harbour as a library. So in a WinRT app we can execute PRG code using Harbour, but we have to do it from a C++ app. (thats not a major issue, as Harbour generates C code, currently in our apps).
What I mean, is that the building process will never be as simple as it is now: harbour compiler, our PRGs and the runtime libraries. Times have changed and now we are forced to use their tools, and this requires a learning curve.