Sony Computer Entertainment just released a new system software update for the PS4, which is now available for download on your console.
The update weighs 336 megabytes and the patch notes are most definitely brief:
Operation quality during use of some PlayStation 4 software has been improved.
Upon installation no change was visible on the console’s UI, confirming that we’re looking at one of the usual small “tweaking” patches released to improve performance here and there. No details on the specifics were provided by Sony Computer Entertainment.