Could the Windows Phone operating system become Microsoft's OS of choice for 7- to 10-inch tablets?

Based on new rumors, courtesy of Windows SuperSite's Paul Thurrott, this scenario isn't outside of the realm of possibility.

Windows Phone Blue, which may or may not ultimately be christened Windows Phone 8.1, is the first "major" update to the Windows Phone 8 OS since Microsoft launched it in the fall of 2012. We've known about the existence of WP Blue for months. The latest rumors I've heard continue to peg Windows Phone Blue's release-to-manufacturing date some time around "spring 2014."

Thurrott's new rumors, from a single source who asked not to be named, include some new specifics around both the UI and guts of the Windows Phone (WP) Blue OS. We've known since February 2013 (courtesy of one of my unnamed sources) that WP Blue would be a stepping stone along the way to bringing Windows 8, Windows RT and Windows Phone 8 into closer alignment around the NT core, programming interfaces and UI look-and-feel. Thurrott's source cites an interesting statistic (which I've not seen Microsoft state publicly), namely, that Windows Phone 8 currently has "33 percent API unity" with Windows RT. Supposedly the goal is for WP Blue to reach a (a very precise) 77 percent by the time it comes to market.

....For now, it's worth reiterating that this new info is from one unnamed source. It's not official, so don't take it as being set in stone. If I hear more, I'll update this post....
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Could Windows Phone Blue be Microsoft's next tablet OS? | ZDNet