Lot of people have same problem – they received developer kit, connected via USB-C to Mac and iTunes shows nothing. I saw lot of solutions, but only one of them is working. So what to do to make your brand new Apple TV visible in iTunes? Answer is… nothing. You can’t. It won’t yet recognize it. If you need to get UDID, just use XCode Devices (from XCode 7.1, not 7.0!) and you can get it easily. So far iTunes doesn’t seems to support new Apple TV yet.