A while back, Apple's COO announced a $3.9 billion dollar investment in something that would be put to "fantastic" use. Now, the amount seems a little high for components that are already out on the market. (camera, memory, etc) 3.9 billion dollars could very well bring the next iPhone a 4" 720p screen. The "leaked" cases that are larger also hint at a bigger screen. (why make the iPhone wider and longer?)