Exactly like the previous hidden bluetooth support on iPod Touch 2G, now developers found out Apple TV 2G too, has a bluetooth support(of course, included in the brand new iOS 5). Apple TV 2G's bluetooth support is mainly intended for keyboard support, but may also be open to app development on this feature, perhaps adding support for many other accessories as well.
The setup for the bluetooth support is simple, right from the settings panel and simply pair with the accessories(keyboard, for now) with a passcode of your choice.
Rumours are also spreading around the internet saying that the next Apple TV will support 1080pixels of HD videos and also certainly putting in the all new A5 processor.
The next Apple TV is scheduled to be out this fall, some sources reported.