The real E Ink according to the Wikipedia "is a specific proprietary type of electronic paper manufactured by E Ink Corporation, founded in 1997 based on research started a the MIT Media Lab. Currently available commercially in gray-scale only and commonly used in mobile devices such as e-Readers and to a lesser extent mobile phones and watches. The material is processed into a film for integration into electronic displays" particularly for e-Readers such as the Sony Reader and the Amazon Kindle among others.
Flexible/fold-able displays aren't anything new. Nor are interactive content or E-Ink. It's bringing these concepts together in a workable package that might take some time.
