I don't like to use this but, OMG, it's you again, you are asking for apps that look like iOS6 to use in iOS7, well, right now all the apps look like iOS6, just use your iPhone and you will notice that.
Not a single app has been optimize or giving the flat look for iOS7, I believe they won't show any changes until the iOS7 GM is released, not because of developers, but because Apple rules or something.