Soon-to-be-released iOS 6 has a new interesting feature for the Apple TV box. In the AirPlay menu users can now select which AirPlay-enabled speakers they want the TV sound coming out from. Never again will you have to use audio cables when connecting external speakers to your TV.
Update: Apple has now updated the Apple TV box. The AirPlay feature only works for music - not audio from movies or TV shows. We hope Apple will add it in the final iOS 6 update for the Apple TV. We have no idea when it is planned for even though iOS 6 is already out for
AirPlay speaker-out in Apple TV
Apple continues to expand their AirPlay system that supports music, video, pictures, and games. With AirPlay users can stream media files between devices and the Apple TV will soon get a new AirPlay speaker-out feature.

With the latest update for Apple TV you can stream video to your TV and sound to your AirPlay-enabled speakers
Many TV users want to connect their TV to a sound system or receiver but it requires either digital or analog cables – and requires the sound system to be located relatively close to the TV. What if you playback show video on the TV screen and stream audio to your external speakers – wirelessly?
This is now possible with the $99 Apple TV box. Only developers have access to the speaker-out function so far but iOS 6 will be released to the public later this year. A few developers have let us know that the feature is working and is fully functional in the latest beta 3 of iOS 6 for the Apple TV box.

You can select your AirPlay-enabled speakers from the AirPlay menu, picture source: anonymous tip
The AirPlay speaker-out function can be found in the AirPlay menu on Apple TV. From here you can select all your AirPlay speakers in your home. The Dolby setting option in the audio has to be turned off. Otherwise, sound volume is very low, it is said.
iOS 6 is expected to be released with the new iPhone in September or October. The AirPlay speaker-out feature could also potentially eliminate requirements for audio cables in the rumored Apple HDTV.