Yesterday Apple Released iOS 4.2 Gold Master For Developers and it turns out Redsn0w 0.9.6b2 can jailbreak it. All you have to do is point redsn0w to the 4.1 IPSW instead of 4.2. If you are planning to jailbreak, make sure to uncheck the Cydia box, because many apps “including Cydia” need to be updated for 4.2. Unlockers should stay away.