"If developers don't want to adapt software for iPhone 5, the App can still successfully show on the screen except for the blackened areas on two flanks," Kuo wrote. "That, however, won't prevent the app from functioning the way it's supposed to."
Completely ignored by Kuo and this article is backward compatibility for NEW apps. Sure, old apps can run fine on the new display size. But developers who want to take advantage of the new real estate will have to consider how to implement it so it works well on older iPhones, which presumably a lot of developers will want to do because the vast majority of the installed base will be older iPhones. The last time this kind of transition happened was when the iPad was launched. We had windowed mode and magnification for iPhone apps, iPad-only apps and universal apps for both iPhone and iPad. Will the solutions be the same? Legacy iPhone apps and apps whose developers don't want to re-engineer for the new aspect ratio will run in window mode, iPhone 5-only apps for developers won't don't want to design for the older screens, and then universal apps for all three aspect ratios? I'm sure developers will adjust but what a pain for them to factor in another screen ratio into their design decisions. Apple has obviously pulled off this kind of transition before but it's not as seamless as Kuo - and Apple Insider - presents it. The pros of a new aspect ratio may outweigh the cons but the additional development time and money imposed by the new aspect ratio is real.
Edited by ddarko - 6/7/12 at 8:10am