This pictures were leaked just now on sammobile the ultimate samsung blog. You will see that the Samsung guys have changed the entire theme of S 4 to a light version. Further there is a new feature called the Smart Scroll. This feature follows you eyes and scrolls the webpage or screenshot as you follow it. I have already given you information about the S IV and its specs.
Citing information from a person who has used the yet-to-be-announced phone, the New York Times reported on Monday that Smart Scroll would be built into the S4. The feature would monitor the movement of users' eyes and move the screen accordingly. As one example, "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."
This is ultimate technology for ebook readers. Keep reading my blog for further updates.