iOS 6 already receives a jailbreak for developers via redsn0w
The iPhone Dev Team has released redsn0w 0.9.13dev1 which will jailbreak iOS 6. This version of redsn0w only supports the iPhone 4, iPod touch 4G, and iPhone 3GS, namely no support for A5 devices. It will be a tethered jailbreak and should only be used by developers as it's a beta and you'll most likely run into issues.


Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/Hkfb41nDKx4/story01.htm
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