Just wondering if anyone knew anything about the supposedly new Greenpois0n jailbreak that will untethered break a 3GS on 4.2.1. Saw a video on YT with a download link but didn't seem quite legit.
Have you considered going to the greenpois0n.com site? They'll post the program there when it's ready. Then this forum will fill with new threads because of the program.
That's the latest relevant part I see. Provided that they plan to release before 4.3, I'd say in a few days. That being said, they also write for multiple operating systems, so it might take a bit longer than that.