According to the New York Times's source, the S IV will downplay the actual hardware specs and focus more on features (a point more smartphone makers seem to be trumpeting these days):
The phone will track a user’s eyes to determine where to scroll, said a Samsung employee who spoke on condition of anonymity because he was not authorized to speak to the news media. For 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.
The New York Times' source didn't reveal which company was behind the eye tracking technology. One possible supplier could be Tobii, but it's unclear if they have a module small enough to fit in smartphones.
Aside from the eye tracking tech, the Galaxy S IV is rumored to have a 4.99-inch display (1920x 1080 resolution), eight-core Samsung-built Exynos processor, 2GB of RAM, 13-megapixel camera with LED flash and 1080p HD video recording, two-megapixel front camera and Android 4.2 Jelly Bean.
Hold on to your seats, because Samsung's "next big thing" is coming soon. We'll be at the Galaxy S IV launch event on March 14, so stay tuned.
-Dvice