Chaitin tech also allegedly signed a non disclosure agreement with Sony regarding that FreeBSD Kernel exploit, and have never revealed the details of the kernel exploit.
They have however spoken in the past about some of the vulnerabilities involved in the jailbreak. For example the Webkit exploit used as an entry point was apparently based on the webkit exploit used in PS Vita’s Henkaku. Chaitin Tech members named the port of that webkit exploit “FireKAKU”, as revealed on reboot.ms.
In other words, there’s nothing new here for the scene: the same old exploit is being showcased in multiple Infosec conventions, a year after it was already revealed, for some reason. In parallel, there hasn’t been any word of a release from hacker qwertyoruiop who claims to have an exploit running up to at least firmware 4.55, and the only rumors of incoming PS4 jailbreaks so far haven’t led to anything concrete.