Guess it was only a matter of time. But Fire360 has been released and now HENkaku has been ported and working for the PS4 with the latest FW. Bet this pushes back the 4.00 BETA FW a bit.
https://github.com/Fire30/PS4-3.55-Code-Execution-PoC
https://github.com/Fire30/PS4-3.55-Code-Execution-PoC