I don't understand what the author is referring to here. The screenshot looks just like I remember iOS app icons looking -- they've always had that canned bevel+gloss look applied to them.
Overall, the new iTunes makes me think that Apple keeps inching towards the Metro look. Gradients, colors and embossing are gradually fading out, and one day there will be nothing left except various weights of Helvetica and monochrome icons on a pure white canvas.