Since Apple made the Apple TV iOS 4.1 firmware available on their website, developers and hackers alike have been scouring through with a fine toothed comb. What they have found so far is quite interesting - Facetime may be coming to Apple TV via your iPhone 4 using AirPlay, there could be DVD remote support, and the device does contain bluetooth code.
Perhaps the most exciting find has been what we touched on earlier today, Apple TV is capable of being jailbroken via the Shatter exploit.
Check out the source links below for more, including Erica Sadun's comprehensive article at TUAW. Should be pretty exciting to see what this little device will be capable of in the upcoming weeks.