System update 1.51 is now live for PS4’s everywhere. Included in this update are system stability improvements and touch ups to the system UI, such as letting users know when they are downloading a game and its patch at the same time. North American PS4s are programmed by default to automatically download system and game updates when they are in standby mode. This means that this update and all future updates will download as soon as they are live and you can get back to gaming that much quicker.
[Source: PlayStation Blog]