Microsoft is set to announce new Surface devices this Tuesday. In addition they've built a cross platform e-inking team.
"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."
http://www.zdnet.com/coming-to-a-microsoft-surface-near-you-cross-platform-inking-7000029565/