The second beta version of iOS 6 - currently only available to registered developers - has just landed, and thanks to Dev Team’s Redsn0w, it can be jailbroken already on A4 devices like the iPhone 4, iPod touch 4G, iPhone 3GS. Of course, the jailbreak is tethered, which means you will need to connect your device to a computer with Redsn0w installed each time your device is turned off or rebooted, but you knew that already.
Although Apple announced iOS 6 only two weeks ago at WWDC, the first beta release to developers gave a firsthand insight as to how the upcoming firmware will look and behave. Now, the Cupertino company has seeded the second beta, with minor bug fixes and enhancements.