Yeah, with the A7 handily pushing around 2048x1536 pixels on the new iPads, even a down clocked “A8” could handle another doubling for a larger iPhone ... i..e, 1280x2272 (2x current 5/s/c), which up to 5” would be an outstanding ~521PPI![]()
Can you explain in which way using a multiple of the 4" iPhone screen on a 5" version would help developers?
The 2x Retina switch was useful since the screen size didn't change. Developers only had to provide "2x" bitmaps and keep their layout as is (iOS multiplies legacy pixel coordinates by 2 automatically).
Now if developers use the same layout for the 5" version it would result in unnecessary huge text and buttons, essentially a blown up version of the 4" version.
Developers would have to redo their layout anyway so the 2x resolution wouldn't help them at all. Also, every touch target and button would have to be resized to compensate for the increased PPI, something that the auto-layout APIs doesn't take care off.
If anything, I can see Apple purposely NOT using a multiple of an existing iOS resolution to prevent developers from taking the easy route and simply let the OS blow up their 4" app on a 5" screen. Much like they did with the iPad (which doesn't use a multiple of the iPhone resolution).