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Not necessarily. If they increase DPI to reach that resolution, I'd have to switch custom graphics to UIKit controls, or create them for the 7" form factor.

Starting to look like image.png, image@2x.png, image-ipad.png, image-ipad@1.5x.png, image-ipad@2x.png

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No, as long as you followed the UI guidelines the mini could just use your image-ipad.png -- the 44 point minimum will be smaller than on the big iPad, but it's the same physical size as on the iPhone and so still usable:

http://castirony.com/post/26466421254/the-case-for-a-7-8-ipa...

The only issue is if you have UI elements that must be an exact physical size (some sort of measurement app with onscreen ruler). Not a very common situation, as far as I'm aware.

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