They are video tutorials of the case studies. So they cover designing an app and a login form in Photoshop, then implementing those designs using Interface Builder and Xcode. About 2.5+ hours of video.
Thanks, you're probably right. I went through a lot of different designs, but this is the only one I really liked. The idea is that it is fluid and accepts any kind of content (multi-colored). Also I wanted it to really stand out in the list of apps in the store.
Since it's a book on design I have to add that the underlined text on the cover doesn't look great.