Wow: according to the NYT, the new Samsung will automatically scroll when it sees that you reach the end of a page:
"The phone will track a user’s eyes to determine where to scroll (...) when users read articles and their eyes reach the bottom of the page, the software will automatically scroll down to reveal the next paragraphs of text.
The source would not explain what technology was being used to track eye movements, nor did he say whether the feature would be demonstrated at the Galaxy S IV press conference, which will be held in New York on March 14.
Samsung in January filed for a trademark in Europe for the name “Eye Scroll” (No. 011510674). It filed for the “Samsung Eye Scroll” trademark in the United States in February.”