well I upgraded my Apple TV 2, had to use MacBook not over the air and I believe most of the functionality is back. and vazandrew seems right it is app specific, if an app developer, PBS radio for example, wants to add airplay functionality are they allowed to? ie is it the developer who decides or apple, can't blame the app if apple doesn't allow?
and yes I do wish I could revert my iPhone to 5.1.1 it keeps crashing I rue restored to iOS 6 as well, subject for another post
one way to get some apps (PBS radio) (puffin browser) to airplay audio, 2 examples, is to start your PBS stream, double click The home button, Swipe to the right until you get to the music controls, Select airplay, And return to the app. It doesn't work on all apps that I found it works on Several.
havnt tested airplay on the phone yet, but I expect it will work.
Thanks to the member that posted the information about updating your Apple TV That seems to have solved my problems thanks.