Apple Releases iOS 4.1 Beta for iPhone 4, 3GS, 3G and iPod touch [Developers Only]
Apple has just released iOS 4.1 Beta, along with SDK for iPhone 4, iPhone 3GS, iPhone 3G and iPod touches. This is for developers only. Only members enrolled in the iPhone Developer Standard or Enterprise Program can access these bits of by signing into Apple Developer Connection.
UPDATE 1: DO NOT update to iOS 4.1 if you rely on an unlock. Doing so will lock your device. You can jailbreak iOS 4.1 Beta on iPhone 3G (which doesn’t rely on carrier unlock, and iPod touch 2G (non-MC model) using Redsn0w 0.9.5b5-5. Follow the guide posted here to jailbreak iOS 4.1 on iPhone 3G, and here to jailbreak iPod touch 2G (non-MC model).