You all must be familiar with the old jailbreaking tool geenpois0n. A tweet by Poxininja the member of the Chronic-Devteam said that:
So we can expect a new release which will be Greenpois0n RC5 very soon and it will also Jailbreak Apple TV officially.
We will post the links as soon as the jailbreak it out. For more updates stay tuned with us.