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http://www.tomshardware.com/news/Windows-blue-windows-RT-Surface-Peter-Klein-Nexus-7,21558.html
Last bit is interesting,The latest report surrounding Windows Blue stems from an analyst of consumer technologies for Valley consulting firm Creative Strategies, Ben Bajarin, who believes this yearly refresh will allow Microsoft and its partners to build tablets in the 7- to 9-inch range. Why? Because "Blue" supposedly supports smaller screen sizes.
The "hard work" Klein is referring to is speculated to be Windows Blue. The company is reportedly pushing to further unify its Windows and Windows Phone platforms and APIs. "We are getting closer and closer every day to write once and run anywhere," Klein said.