iOS 6 Untethered Jailbreak : Famous iOS hackers Pod2g, MuscleNerd, Planetbeing, and Pimskeks have formed a new jailbreak group called Evad3rs Dev-Team. It seem like they have somehow managed to find some vulnerabilities in iOS 6 firmware and they are not releasing iOS 6 Untethered Jailbreak for public due to some reasons.
The first reason of not releasing the iOS 6 Jailbreak is the release of iOS 6.1. For devs it is very difficult to find out the vulnerabilities in any iOS firmware, so if the developers will release the Jailbreak before Apple iOS 6.1 release, Apple will fix the vulnerabilities in the iOS 6.1 and we will not be able to see iOS 6.1 jailbreak in the near future.
At the time Apple has already released four betas of iOS 6.1 and the fourth beta version will expire on the 28th Jan and it could predict that Apple will release Gold Master GM version of iOS 6.1 in this week. If Apple release iOS 6.1 firmware in this week then it will also give us hints that we will get iOS 6 Untethered Jailbreak in next couple of days.