According to Wiocm tweet, iOS 6.1.3/6.1.4 jailbreak is almost there and it is only for few selected devices.
In case you haven’t seen @winocm’s latest tweet:
The status of the jailbreak is pretty much: it needs work but its almost there. (For a very small subset of devices.)
— winocm (@winocm) September 23, 2013
A progress is being made and pretty soon we iOS 6.1.3/6.1.4 jailbreak available
[Via] Winocm