Winocm has revealed the successful jailbreak of the iPhone 5 on iOS 6.1.4 via a picture just posted to Twitter.
About a week ago, winocm announced that he had a binary that would perform an untether of the iOS 6.1.3 jailbreak. At that time he had only tested the jailbreak on an iPhone 4.
It appears as though winocm’s work on the jailbreak has progressed to the iPhone 5 and iOS 6.1.4. At this time there is no ETA for release.