Folks who have updated their iDevices to iOS 6.1 beta 2, developer release and want to perform jailbreak then they can use latest Redsn0w which can do a tethered jailbreak of iOS 6.1 beta 2.
Although, the iPhone Dev team have not yet released an updated Redsn0w for iOS 6.1 beta 2 jailbreak, and obviously they will do that with the release of iOS 6.1 public release even you can do iOS 6.1 beta 2 tethered jailbreak with Redsn0w 0.9.15b3 which you can grab through links below.
Download Redsn0w 0.9.15b3 for Mac
Download Redsn0w 0.9.15b3 for Windows [Run in Administrator Mode]
See also:
How to Do Tethered iOS 6.1 Beta 2 Jailbreak with Redsn0w