The PS4 has been available for almost a full week; yesterday Sony released the console's first firmware update. The update, 1.51, addresses stability issues and also contains some minor UI tweaks or 'refinements.'
For users in North America, your PS4 has automatic downloads for system and game updates enabled by default when the console is in stand-by mode. This means you don't have to do anything to download this update. Your PS4 will automatically download it once it becomes available.
The PS4 launched last week in the United States and Canada. Come November 29, the console will launch across Europe and in Australia. It will then launch in the UAE and Saudi Arabia on December 13. Hong Kong, Taiwan, Singapore, and Malaysia are getting the console on December 17, 18, 19, and 20, respectively, while South Korea, South East Asia, South Africa and India are also supposed to get the console in December. A total of 99 days after the U.S. launch, on February 22, 2014, the PS4 will hit Japan. Presumably, update 1.51 will be available right out of the box for users in these regions.