Earlier today, iOS 6 beta 3 was seeded to developers, and the Dev-Team is hot on its heels.
They have released an update to RedSn0w, so those of you who have updated to the latest beta can now jailbreak.
From The Dev-Team Blog:
The “dev3” version covers today’s 6.0beta3 release (and also adds explicit support for 6.0beta2). Please point redsn0w at the 6.0b3 IPSW in order to jailbreak beta3 and boot tethered.
It’s worth noting that just as iOS 6 betas are meant for developers, so is jailbreaking them. This version of RedSn0w will not install Cydia, due to the fact that a number of packages have not been updated to support the new firmware.
You can download RedSn0w 0.9.13dev3 here.