previous update last month, today Sony pushed a PS4 System Software / Firmware 4.55 Update (confirmed as non-mandatory at this time by @VultraBabe) live which appears to be another of their infamous stability updates to 'improve the quality of the system performance' which may fix the WiFi issue and patch exploit holes.
Download: PS4 Firmware 4.55 Update (US) / PS4 Firmware 4.55 Update (EU) / PS4 Firmware 4.55 Update (UK) / PS4 Firmware 4.55 Update (AU/NZ) / PS4 Firmware 4.55 Update (JP)
We'll update this article once we catch word on whether the JailbreakMe PS4 WebKit Userland Exploit, PS4 4.50 Kernel Read / Write Exploit or the Rumored Brazilian PS4 4.50 GameSharing Method is confirmed to be patched in OFW 4.55... until then, as usual it's recommended not to update your PlayStation 4 console.
Changelog via PS4Firmware.com: Main features in version 4.55 update
- This system software update improves the quality of the system performance.
Update: As of 4/19/2017 PS4 Firmware 4.55 has now become mandatory to login to Sony's PlayStation Network.
Cheers to @Centrino, @DarkElementPL, @guido970, @Jeff and @simobuoncuo in the PSXHAX Shoutbox for sharing the news this morning!