Following the PS4 4.05 Kernel Exploit, news of his PS4 5.00 Kernel Bug, confirmation of achieving PS4 5.00 Kernel Code Exec and his recent PlayStation 4 Dev Hints today popular hacker Qwertyoruiopz released a PS4 4.55 Kernel Exploit publicly!
This comes after his JailBreakMe PS4 4.0x Webkit Exploit release followed by the Userland Exploit Breakdown, so while those on PS4 4.06 and 4.07 OFW can make use of the new kernel exploit for 4.50 and 4.55 users it will be up to PlayStation 4 scene developers to bridge the required userland exploit gap to the 4.55 kernel exploit.
Until then, based on the PS4 Game Minimum Firmware Version requirement lists according to notzecoxao some new PlayStation 4 games should surface soon in PKG format including Nioh, Nier, Hitman (latest update) and Persona 5.
Yesterday we saw the release of a PS4 4.55 Kernel Exploit, and today 73n1x69 shared a Github repository from ALEXZZZ9 (Twitter) of ax9.me for a PS4 5.01 WebKit Exploit PoC (Proof of Concept) with some additional details on what it could mean once PlayStation 4 developers examine it.
While PS4 scene developers have a chance to look it over, thus far @Al Azif let us know in the PSXHAX Shoutbox that, to quote: "It successfully dumps libkernel and libSceWebKit2 ... but yeah it's real" while others are reporting that it also works on PS4 5.05 OFW and even PS4 5.50 Beta 3 so expect Sony to patch it shortly.
And then earlier today PS4Hen was released, PS4 is fully jailbroken and running unsigned code in userland.
http://wololo.net/2018/02/28/ps4-4-55-holy-grail-ps4hen-released-enables-pkg-support-homebrew-backups/