[ricardobeat]

That's really just two sizes, 1024x768 and 320x480, which you create at 2x resolution. And these are separate apps most of the time.

There is no expectation that controls will be the same physical size on the rumored iPad mini; what happens is that scaled down they already have the same hit area as an iPhone, so you don't need separate graphics for it.

It all fits beautifully, and one has to wonder if this was all planned from the start or just luck + sensible decisions.