Apple has added a resource for iOS developers that will help them follow Apple’s UI design standards for iOS 7. This is useful to developers, because it helps them update their apps for the new look. It’s useful for Apple, because it gets more developers on board with updated apps.
You can head over to Apple’s iOS developer center and check out the guide if you are a registered iOS developer. The information is pretty cool, and it’s interesting to read it even if you aren’t a developer. There are lots of little things that you can read, and they make you say, “Oh! That makes sense,” or “That’s why they do that!”
You can check it out here. You’ll need to be a registered developer to view the content.