The controller is at the heart of the display of your Sony Reader, Kindle, etc. and Epson has been the prime manufacturer. Now they have announced a new, updated controller for E Ink displays. This is important because the controller sets the speed of the display, as well as the display features. According to E-Ink-Info, the new controller allows for multi-regional and concurrent display updates and for direct touch/pen drawing. Additionally is supports picture-in-picture, rotation, transparency and hardware cursor functions.
Technical brief: http://www.epsondevice.com/webapp/docs_ic/DownloadServlet?id=ID002070