That's how apple can milk the iPhone loyalist..... Only come out with a 4.2" screen for the next phone. Then the S version, ( with minimal upgrades), then the next version can go up to 4.4", then two versions of that, and so on, until they get to 4.7 or 4.9".
Just think... Apple could have phone the size of the S3 and the HTCs in about 8 or 10 years! Think of the milking they could do (and its not too far fetched).
I think if apple were to move to a larger screen they would keep that for 3-4 years so developers wouldn't complain about having to redo their apps every year
I would like an iPhone 5S or 6 with the exact same form factor but a 4.2-4.5" screen.
Example:
Image
Nope 4" iPhone + 7.9" mini is a perfect on the go combo. I returned the life proof case because I could not get use to the bulk.