Video posted by him;-
https://www.youtube.com/watch?v=EiYxYB_OcXQ
Just yesterday i0n1c and winocm posted a video and pic saying that the have sucessfully jailbroken ios 7.1.1 on an iphone 5c and on an iphone 4 respectively.Today Yeongjin Jang posted a video on youtube showing a jailbroken ios7.1.1 on an iphone 5s and he also havent released any public tools for jailbreaking ios7.1.1
i0n1c is unlikely to release a public tool to jailbreak ios7.1.1 but winocm is to join apple community soon
The video above also shows how he was able to install unsigned ios apps wirelessly on an jailbroken ios 7.1.1
i0n1c and winocm used different methods to jailbreak ios 7 and Jang may used the same method as i0n1c or he have used a totally different method to jailbreak ios 7.1.1 its unclear
And also stay away from sites claiming that they have tools to jailbreak ios 7.1 or 7.1.1 please stay away from those sites because there is no public release of ios 7.1.1/7.1 jailbreking tool those sites are scam