Rob Rhyne with a thoughtful article on iOS 7 design being about materials rather than pixels. I couldn't agree more. I have been working with iOS 7 closely for the last few weeks and this really resonated with me after digging into it for a while. I also love the new design, not because of (or in spite of) the font, icons and any other number of superficial things, but because of how it moves, interacts and plays.
Every time you find yourself writing UIAlertView alloc, stop and think. I have an app which I (mostly)love, I use it several times a week and and the end of one of its workflows it sends an email out using the standard mail view controller. After sending the mail, it informs me with a modal alert "Email is queued for sending by the Mail app". I know, I just hit send. Every time.