If you're currently rocking an iOS 6.1 tethered jailbreak on the iPhone 4 or the iPod touch 4th generation, then you have a decision to make. It's being recommended that you go ahead and reinstall stock iOS 6.1 back on to your device, but you can, however, opt to remain as you are, and instead install a debian package that will provide the iOS 6 untethered jailbreak.
Just as with the previous Rocky Racoon jailbreak for iOS 5.1.1, users who already have access to Cydia by means of a tethered jailbreak can "convert" their tethered jailbreak into an untethered just by installing the debian package via Cydia once released.