E Ink CMO Sriram Peruvemba provides a new half hour video showcase of some of the latest E Ink technology demos and prototypes, including the idea of using E Ink soon on the back-sides of all Smartphones and Tablets!
Source:
http://armdevices.net/2012/09/01/e-ink-at-ifa-2012/
They also shown the idea from InVue to use E Ink for Cabinet Locks: