Notification Center in iOS and OS X is great in concept but kind of crappy in practice. First off there’s the linen background that doesn’t really make sense when you’re pulling down a curtain for notifications in iOS. There’s also those tiny little X buttons that you have to tap twice to close notifications, and a couple other annoyances that fill up the Notification Center page.
Alex Saretzky decided that Notification Center needs to be spruced up by simply applying Apple UI concepts that have been used in other apps. His new concept for the Notification Center isn’t a complete revision, but more like fine tuning, and it’s something that Apple should implement with iOS 7.