PS4 6.XX JSC_ConcatMemcpy WebKit Exploit POC thread and based on the Tweets below is not to be confused with M0rph3us1987's 35c3 Speech later this month.
While there is no ETA just yet, established PlayStation scene developer @zecoxao announced on Twitter the following from the embedded Tweets below to quote:
"Top Secret method for ps4 6.02 coming soon..." followed by "reminding everyone that this is a method, NOT an exploit. it'll only be good for things like games, nothing else" and also "once it's patched, it'll be over again."
This rumored 6.02 PlayStation 4 method has also been confirmed as working on 6.20 now, and comes following both the Method to Handle PS4 Fake PKGs & SELF / FSELF and PS4 PKG Install from Internal HDD via FTP & BGFT Method by PS4 scene developer @flatz.