That seems like the only thing that they managed to keep - the assured physical dimensions of UI elements. The 44 point as a minimum guideline for tappable but

That seems like the only thing that they managed to keep - the assured physical dimensions of UI elements. The 44 point as a minimum guideline for tappable button size is valid for all resolutions (4:3 1x, 4:3 2x, 16:9 2x, 16:9 3x). P.S. At least on the iPhone. The iPad mini (sporting the same resolution as the physically bigger brothers) will produce smaller UI elements.