Nadella Merges Windows Phone, Windows - Business Insider

I'm guessing Microsoft won't try the one-model-fits-all user experience approach again, however

"He explained, "In the past we had multiple teams working on different versions of Windows. Now we have one team with a common architecture. This allows us to scale, create Universal Windows Apps."

This is a major departure from Apple's style and from Microsoft's previous approach."

Nadella Merges Windows Phone, Windows - Business Insider