Sony Computer Entertainment just made system software update 2.50 code named "Yukimura" available on the PSN. The download weighs a rather light 245 megabytes.

Below you can see the full patch notes, directly from my PS4. They're rather extensive, with quite a few features and improvements added to the console's system software.

Before you start reading, if you care for a history lesson on why the update is called "Yukimura," you can check out my post here.

Incidentally, PS Vita system software update 3.50 is also available for download.

PS4Update