Previously, wasn't it just follow Apple's style guide or go home? If so, what's happened in iOS 7? Are Apple just being far more lax in enforcing a style guide or is the style guide out of the window now?
Nope, that wasn't really the case before. There were plenty of apps that deviated from Apple's styles, it's just that their UI tools made it easy to design your own app with your own interface. I think we'll see a lot of apps that look like stock iOS apps once the app makers that have been holding off/don't have a UI Team realize they need to update their apps to match the modern visual style.
