Comex has announced that iOS 4.3.1 and 4.3.2 will initially not be supported in his upcoming jailbreak due to time constraints, therefore users wanting to use the jailbreak should upgrade to iOS 4.3.3
The iPhone Dev-Team has announced that they will release updated versions of both RedSn0w and PwnageTool to provide an untethered jailbreak for iOS 4.3.1.