Photo credit: MJ/TR (´･ω･) (Flickr)
It will come as no surprise that devoted jailbreak dev MuscleNerd has successfully jailbroken iOS 6. Using an iPod Touch running the iOS 6 beta 1 firmware, he has managed to jailbreak the device albeit in a tethered manner and in no way suitable a format to run Cydia or make available for a public released.
This is promising news. Please remember, no jailbreak for iOS 6 will be made available until the final version of iOS 6 is publicly released by Apple. Letting the cat out of the bag early will simply just allow Apple to close the holes and vulnerabilities used to exploit the system and enable the jailbreak.