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Retaining the horizontal resolution and screen size was a wise choice. Apps usually have content that users scroll vertically. So most apps won't have to change their assets for the new iPhone. Games, however, do not use the native UI elements so they probably will be problematic.

I am not an iOS developer though. Perhaps someone who knows better can explain what impact this resolution/size change will have.

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Apple is introducing auto-layout in iOS 6, which will make it relatively easy to design apps which scale to different resolutions. There were at least 3 talks on auto-layout at WWDC 2012.

Only new apps will be able to use auto-layout. I was talking about the backwards compatibility, that is whether existing apps will work well.

From the couple of talks I heard, I think Apple said something about auto-converting 'at runtime' in iOS 6 existing guide-based layouts into the new auto-layout thing based on constraints.

I keep forgetting that I am bound by an NDA. Can't say nothing more.

If your app was well-designed, you have to handle the double status bar on iPhone anyway. This change is pretty much the same as the double status bar.

So: well-designed app might not need to do anything at all.

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