The reference is inside of an Apple TV framework related to the device’s AirPlay functionality. The mention of the next Apple TV is the highlighted “AppleTV4,1.” The current Apple TV is “AppleTV3,2″ while “3,1″ is the 1080P model introduced in March 2012, and 2,1 is the first iOS model introduced in September 2010.
The reference to the next-generation Apple TV 4,1 first appeared in iOS 7.0 in September, but the reference has not been unearthed until now. The sighting of Apple TV 4,1 is confirmation that the new device is in the works.
Would love for this to be the iOS based game-centric set-top box previously rumored.