Windows 10 has finally rolled out and some have already gotten their first taste of the brand new OS. The first reviews are coming in and, all in all, it's a rather mixed bag. But now that desktops and tablets have had their fair share, the more mobile-inclined are perhaps more curious about the smartphone incarnation of Windows 10. When will Windows 10 Mobile descend and on which devices first? Fortunately, it seems that Microsoft has finally spilled the beans on that. Or at least the first beans.