It's called tweaking and improving the design during the beta phase, not somehow reverting or taking away of a new look. You might not like the tweaks or improvements, but then a ton of people didn't like the original ones that were there in beta 1. It's all personal taste, but it doesn't mean that Apple is doing something wrong somehow or somehow not doing what it said it was going to do.Apple redesigns iOS completely for iOS 7 and then in betas 4 and 5 starts regressing back to iOS 6 with rounded rectangles and arrows.
I wish I could keep running beta 3 if it wasn't for the call bug. The new settings menu looks significantly worse. The new arrow on the lock screen kinda bothers me, but I know that it's probably going to stay because people can't figure out which way to swipe.
The fact that they teased a whole new look and are slowly taking it away is frustrating!