The question that many iPhone users out there always ask after a new firmware version is pushed out is “when will the jailbreak be released?” Now iPhone developer and hacker Joshua Hill of the Chronic Dev Team has provided an ETA for the arrival of the updated GreenPois0n jailbreak tool for the iOS 4.2.1 firmware. If you’re not the patient type, the good news is that it has been confirmed that GreenPois0n will be updated to support the 4.2.1 firmware (tethered or semi-tethered) within a few days. At this moment, it doesn’t seem like the cat and mouse game between Apple and jailbreakers will be ending anytime soon.