If you are having issues connecting your Apple TV to your WiFi network since updating to 6.0, you may find the following article helpful:
I use the Apple TV Ethernet port to connect the TV Ethernet. If Apple TV detects an Ethernet cable connection, it will attempt to use the cable connection to get to the Internet. Disconnecting the Ethernet cable enabled the WiFi setting on the Apple TV menu. That took a bit of swaptronics to isolate the issue.