A new rumor has surfaced that claims the next iPhone will have a larger 4-inch screen. The rumor comes by way of component supplier sources and DigiTimes. According to the rumor, the production lines for the next iPhone are in testing right now and the screens are supposedly 4-inch.
I can see a bit of validity here, the iPhone used to have a large screen compared to other smartphones and today many phones are over the screen size of the current iPhone. There are also some rumors that the next iPhone and iPad will both sport multi-core processors.
A larger screen and a dual-core processor will help the iPhone out to compete on paper with the other smartphones on the market running Android with multiple cores and larger screens. Naturally, there is no official word from Apple on any iPhone changes.