According to a Bloomberg 'people familiar with the product' say Samsung's upcoming flagship smartphone, the Galaxy S4, will feature a 5-inch screen, 0.2 inches larger than last years S3, a Qualcomm quad-core chip in the US and in other markets a Samsung "octacore" eight-core chip. Bloomberg's sources also say that the much rumoured eye scrolling won't be in the Galaxy S4, though it may appear in future versions. They say that a a more simplified use of eye-tracking will be in the smartphone, with the ability to pause videos when the user's eyes move away from the screen.
As usual take all this with a pinch of salt. Samsung will officially reveal the Galaxy S4 on March 14 in Times Square New York at its Unpacked 2013: Episode 1 event.