PS4 Kexec Kaslr support for 3.55, 4.00 and 4.01 Firmware followed by hints on PS4 SAMU Encryption, and now neochampion2 (aka spars21) shared with PlayStation 4 developers an iOS9_Pegasus_iOS_Kernel_Exploit.pdf file discovered by @vettegast that may reveal details how Chaitin Tech made their PS4 4.01 kernel exploit demonstrated at GeekPwn 2016.
The document from zhengmin1989 contains a technical analysis of the Pegasus exploits on iOS, of which similar attack methods are believed to have been used on the PS4 4.01 Jailbreak kernel exploit.
Download: iOS9_Pegasus_iOS_Kernel_Exploit.pdf / GIT
A few other interesting tweets making their rounds on the Twitter circuit come from mntadr56 (aka mntadrr) as follows:
Related GIT appears to be empty though:
Update: Credited @vettegast as the PDF discoverer with more details HERE thanks to @kazookid0!