After recently releasing their jailbreak for iOS 4.3.1 via PwnageTool and RedSn0w, the Dev Team is now getting ready to unleash their UltraSn0w unlock.
The current 4.3.1-compatible UltraSn0w is currently being tested by a few beta testers, and according to a tweet by Dev Team front man MuscleNerd, if everything goes well, UltraSn0w should be released tonight...