Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You want Facetime Audio, or you want Facetime Video? The latter IS available. When I load up FT my face appears.

The Title is FaceTime Audio.......

Im guessing its only for IOS 7 Devices since no one says yes to that
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.