The problem with his article is sensationalism. This isn't an issue that's unique to the Apple iPad or iPhone, this application (and the core derivative) would work on any smart phone/tablet device. And.... best of all it can be adapted to work on even physical keyboards. Instead of taking the iOS tangent, he should have stuck with the movie theory and actually showed how this is possible using a physical keyboard (differential lighting on keypress
.. or a keyboard with backlight etc). IMO that would be more impressive.