I am having issues with Airplay too. Sometimes the option shows up in my control center and sometimes it doesn't. When it does, if I try to engage Airplay to play on my Apple TV the Airplay connection drops and the option disappears from my control center menu. I can get the Airplay option to reappear in control center by turning off Airplay on my Apple TV and turning it back on again, but I get the same result when I try play something. I am chalking it up to a bug, either in iOS7 or in the Apple TV. I have faith that Apple will fix it in due time, so I'm not too worried about it.