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Microsoft is consolidating teams in Office, Windows, Surface and Perceptive Pixel to work on a unified digital inking strategy and set of technologies.



From All About Microsoft:
Microsoft already supports digital ink and digitizing pens with its Surface Pro devices. According to various sources, the expected ARM-based Surface Mini will be optimized to work with a pen, as well.
onedigitalinkstrategy

BUt the Surface team isn't the only force inside Microsoft working on improving pen and digital ink support. In fact, there is a Cross-Group Inking team working on making pen input better across Windows, Office, Surface and Perceptive Pixel devices.
  Coming to a Microsoft Surface near you: Cross-platform inking