Now that Android has matured to the point of being solid in its own right, manufacturer skins don't rely so much on fixing the problems with the OS as they do creating their own platform. In order to differentiate from the competition, the new Galaxy S needs to do things the One series doesn't. While HTC focuses on improving its audio and visual performance, Samsung is attempting to boost its wow factor by improving on its eye-tracking technology. At least, if the rumors are true.
Speaking to a New York Times blog, an anonymous source (allegedly a Samsung employee) told the publication that the new Galaxy S IV would include a feature that will track a user's eyes to determine when they've reached the bottom of a page and automatically scroll to reveal more text.