If apple were to quadruple the pixels again on a new iphone it would be 1920 x 1280. Even with a 4.7 inch display, that comes out to 490 PPI. This just seems unreasonably large and unnecessary. If apple were to increase the screen size they would have to do some fractional increase to keep the same display parameters. Unless they let everyone know in advance they are doing this there is no way developers would be able to quickly make such significant changes to their apps. Either apple is keeping the same resolution, or they are going to tell developers about a new resolution in june, to give them 3-4 months to make all the changes they will need to.