I think now that retina is widely adopted, Apple no longer needs to worry about 2x, 3x, etc.
Even if the phones are 1.457x or whatever, I bet iOS8 will just do its best to scale elements as needed- Since the resolutions are so high already, a scaling error of a fraction of a retina pixel is totally not noticeable.
Even if the phones are 1.457x or whatever, I bet iOS8 will just do its best to scale elements as needed- Since the resolutions are so high already, a scaling error of a fraction of a retina pixel is totally not noticeable.