Now that Apple has released iOS 6 beta 3, redsn0w has been updated to version 0.9.13 dev 3. So if you're a jailbreak developer, it's a good idea to make sure you update to the most recent beta so you can get to testing your jailbreak apps.
Note: This release of redsn0w is meant to be a developer release and not a general release to the public. Just as you should expect bugs in a beta version of iOS, you should also expect them in beta jailbreak tools. This release does not install Cydia. While it is possible to manually install Cydia after jailbreaking, we don't recommend it. If you aren't a developer, stay away.
Your jailbreak will be tethered so once the jailbreak process is complete you'll need to perform a tethered boot with redsn0w.
Let redsn0w do its thing. Your device will reboot and then you should be good to go. And again, keep in mind that this is a beta release and is not meant for the general public. Expect bugs and crashes. We only recommend installing beta software and beta jailbreak tools on test devices if you can help it.
If you do run into issues or have questions, you can hop into our jailbreak and unlock forums via the link below.