MuscleNerd: The 4.3.1 issues (signal bars, etc) are fixed http://is.gd/OYktXf but need a few days to test all devices + FW (again: not a new unlock!)
However it is to be noted that this release of Ultrasn0w wont be a new unlock for iPhones with newer basebands, instead, it will only fix the compatibility and signal bar issues on the existing devices, which are jailbroken (with preserved basebands: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) on iOS 4.3.1 using PwnageTool or Sn0wbreeze.
MuscleNerd: It’s probably confusing, so worth repeating: this isn’t a new unlock. It’s a compatibility fix for current unlockers only
MuscleNerd: (and for those retaining older baseband for resale value even though they don’t use the unlock themselves)