The PlayStation 4 system software update (codename Musashi), will officially be rolling out to PS4 consoles tomorrow, worldwide. If you're patient enough of course, you can probably grab it later tonight.
PS4 3.50 brings some much requested features such as the ability to appear offline, or get notifications when certain friends go online. There's also the PC/Mac Remote Play feature, which requires at least Windows 8.1 or OSX 10.10. Other features include the ability to schedule a user event for friends or groups, and Party enhancements too.
Check out PS4 3.50 later! Hit the PS Blog for more details.