I really don’t see Apple waste all that research work for the right size of controls on iPhone’s screen and just increase all of them in the next generation iPhone just to have a bigger screen. Not to mention that increasing the size of the screen and at the same time keeping the resolution to 960 x 640 would mean decreasing the ppi, which would mean a lower quality Retina Display 🙂
… Unless they would increase the screen resolution to some 1280 x 720 pixels, which would make for at
least most a 4.5 inches screen to be above the 326 ppi Retina Display..
What do you think? I bet for a 4 incher