Last week, the iPhone Dev Team had announced that the PwnageTool that will be used to jailbreak the second generation Apple TV has been developed and shall be releasing soon. Today, Joshua Hill also known as p0sixninja from the Chronic Dev Team has announced that the Greenpois0n jailbreak that will make use of the Limera1n exploit to break into the new Apple TV has been successfully tested. He has posted a picture of the Apple TV with a customized background as proof of the same.
There is no word on when this new Greenpois0n version shall be releasing to the public. Expect it soon. Meanwhile, if you are still wondering if the jailbreak is going to be worth it, be rest assured that it is not at the moment. The new Apple TV still does not run any iOS applications and unless we have more work on making these applications Apple TV compatible, the jailbreak process is going to be more about the thrill than anything else.
As an aside, jailbreaking is risky and can lead you to lose your Apple warranty. So proceed at your own peril.