Every hacker out there is currently trying to find a useable stable jailbreak for the iOS 6 beta 1 and so far only MuscleNerd has been successful, that too not completely since Cydia does not work on his device. Though MobileSubstrate still functions properly and he is able to install jailbreak tweaks because he installed the SSH bundle.
Since MuscleNerd was able to do so, he has tipped me saying that he will be releasing a new version of Redsn0w namely 0.9.13dev1 for developers on iOS 6 so that they can install the SSH bundle on their device and then install their staple jailbreak tweaks.
You should however note that this won’t be installing Cydia on your device. Also this version of Redsn0w is exclusively for devs so I and countless others suggest you to stay away from it.
This version of Redsn0w will install the SSH bundle only on devices capable of running iOS 6 other than the iPhone 4S, the iPad 2 and the new iPad.
Be sire to check our Downloads page, since it will be updated once Redsn0w 0.9.13dev1 is out.
Update: MuscleNerd just tweeted about it:
Stay tuned with us for more info at iOS Jedi Blog or join our Facebook fan page or Follow us on Twitter or subscribe to the RSS feeds or connect with us on our Freenode-IRC channel for any iOS question you have.