I told you that the new untethered jailbreak solution is in the beta testing stage, but i0n1c, the one who developed it, sent his exploit to the Dev Team, which is currently testing the solution. i0n1c's exploit will allow us to untethered jailbreak all existing devices, but not for the new iPad 2 tablet for which there is currently nothing usable. It is not known when the new untethered jailbreak solution for iOS 4.3.1 will be available, but the Dev Team should implement i0n1c's exploit in redsn0w as soon as possible.
When the new untethered jailbreak solution will be released, you will find out here.
