Well, here is my feedback about covers and swips(not with SF 1.9). I don't undersand how you can find them intuitives. The first time I saw covers, I thought the icons were buttons, and there is no way to discover than there are swips with them (or by accident). However, with a good UI, it should not be required to read the manual to understand how to read it. So having buttons instead is a good idea, but it should be settings allowing users to choose if they want buttons or swip.