I would like to see a family of iphones released. One size does not fit all.
A spec bump IP4 would be great with a new larger screen iphone = choice. Also a larger screen iphone might just open up enough real estate for LTE and so on. I can buy different size MacBooks Pros, MacBook Airs, iMacs -- why not some selection options with the iphone beyond internal storage? And, selling an old model phone for cheap is not the kind of option I am thinking about, or interested in seeing.