Sony has released firmware 5.50 a few hours ago. The list of new features for this firmware is pretty big, including support for custom wallpapers, quick menu changes, changes to notifications and better ways to filter and organize content from the library.
The official playstation blog has a good summary of what this new firmware adds.
But of course, for the scene, what matters is whether the recently released 5.0x Webkit exploit still works. Early rumors say that yes, it does, however this would still need to be confirmed by a few verified hackers to be 100% sure. And, to be clear, a usermode entry point such as a webkit exploit is nice to have, but is only the first step to full control of the device: A kernel exploit is required to consider the console fully hacked, and no hacker has stated they would release such an exploit for 5.xx at this time.
Independently of that, the advice for people who expect to hack their PS4 is, and always has been, to stay on as low a firmware as you possibly can. It’s easy to upgrade when needed, but it’s impossible to downgrade.