As you may have guessed, you can jailbreak iOS 6 beta 2 with RedSn0w 0.9.13dev1. This is a tethered jailbreak, and since the iPhone Dev Team has not updated RedSn0w to work with this latest firmware version, you will need to point to the prior beta firmware in order to jailbreak iOS 6 beta 2.
Check inside for the full step by step tutorial to learn how to easily jailbreak your iOS 6 beta 2 installation.