The Chronic dev team has pushed out the Greenpois0n release candidate 6 that enables jailbreaking Apple TV now. With this new Greenpois0n RC6 you’ll be able to install NitoTV – App that lets you play more video formats, check RSS feeds, watch weather forecasts, run emulators and much more. Once you jailbreak the Apple TV 2G, there’s no hassle of installing NitoTV via SHSH. Mostly it’s meant for the game emulators and the new version of Greenpois0n RC6 will fix any persisting issues.
Previously released Greenpois0n RC5 allowed jailbreaking all iOS 4.2.1 based devices.