A new system software update is now available for your PlayStation 4, and it's one with a bit of an odd name -- 5.53-01.
The update is just under 70MB, so it's only a small download, and it "improves system performance", as you might expect. What's strange is that, normally, new updates simply increase the version number by .01. Also, we didn't need to restart our PS4 to install the new firmware. Could this be an update of an update? Did Sony need to hurry out a minor patch for whatever reason? We'll likely never know why it's adopted this name format, but we're sure there's a sensible explanation.
If anything crops up regarding this, we'll of course keep you posted, but for now, it seems to be a normal stability update.
Update: It seems that this curious patch added the ability to share a song you've listened to on Spotify via your profile. Also, a new Media tab on your profile page contains all your shared screenshots, videos, and more.