The possibilities of this are astounding. Obviously some sort of braille reader. It's not very dynamic (it can only have one set of buttons at a time, apparently) but just from a quick conversation, I'm thinking Apple could use this to completely remove all the buttons on the iphone. For example, the volume buttons don't do anything in certain situations. With this technology, the buttons would be gone in these situations!
Tactus Technology Can Make Physical Buttons Rise Up Out of Touchscreens - Core77.