The shared Windows/Windows Phone kernel might be named OneCore, will let you develop once for both platforms

This is certainly an ambitious undertaking, and a watershed moment in the Windows franchise history. If Microsoft manages to pull it off, it will be the first one amongst the major Silicon Valley players that will have unified both the interface design language, and the backend development for all of its platforms. The lines between phones, tablets, convertibles, laptops, desktops and game consoles will be blurred even further, it seems, and Microsoft is shaping up to be at the forefront of this unification, once the Nokia smartphone business is fully absorbed.

source: WalkingCat via WMPU