From what I can figure, Apple can't give us a 4" screen and keep 960 x 640 resolution. So what does this mean for the next iPhone? A 4" display @ 960 x 640 would drop the 'Retina' ppi (pixels per inch) to 285. Well below the 300 limit where Apple can still call it 'Retina'. Apple will have to keep the resolution at 960 x 640 because they are not going to make developers do a third version of everything. We're stuck with 960 x 640 and that means no 4" screen. A 3.8" screen, however, just barely falls within the 'Retina' range at 300.26 ppi (or there abouts), so Apple can very well bump the screen up to 3.8", keep the same 960 x 640 and everyone wins because the human eye isn't supposed to be able to distinguish anything above 300 ppi. So, unless Apple comes up with an entirely new concept (and they might), 3.8" is all we're gonna get, but they should, at least, be able to fit a 3.8" in the same form factor without too much trouble. That would be a good compromise between the "I can't use a phone the size of Utah!" crowd and the rest of us who want more screen on our multimedia device.