if we double 1136x640, current 16:9 5s ratio to 2272x1280 = 2607 diagonal resolution, what would the ppi for the next iphone is? i did calculations for your pleasure LOL.
4 652 ppi
4.1 636 ppi
4.2 621 ppi
4.3 606 ppi
4.4 593 ppi
4.5 579 ppi
4.6 567 ppi
4.7 555 ppi
4.8 543 ppi
4.9 532 ppi
5 521 ppi
5.1 511 ppi
5.2 501 ppi
5.3 492 ppi
5.4 483 ppi
5.5 474 ppi
5.6 466 ppi
5.7 457 ppi
5.8 449 ppi
5.9 442 ppi
6 435 ppi
4 652 ppi
4.1 636 ppi
4.2 621 ppi
4.3 606 ppi
4.4 593 ppi
4.5 579 ppi
4.6 567 ppi
4.7 555 ppi
4.8 543 ppi
4.9 532 ppi
5 521 ppi
5.1 511 ppi
5.2 501 ppi
5.3 492 ppi
5.4 483 ppi
5.5 474 ppi
5.6 466 ppi
5.7 457 ppi
5.8 449 ppi
5.9 442 ppi
6 435 ppi