All this is coming from security researcher Stefan Essar aka i0n1c's recent tweet.
i0n1c was the man behind iOS 4.3.1 jailbreak and has been researcher for quite a long time. He has not specified the matter but it is bad news for the iOS jailbreak community indeed.
There is no public jailbreak for iOS 6 yet. There is a jailbreak by chpwn named "failbreak" which is reserved for iOS jailbreak development though. But let us hope that someone in the iOS jailbreak teams will bring us the iOS 6 untethered jailbreak pleasure soon. Keep your fingers crossed.
Until next time, Bye from +Perez Park