Update: Sony has contacted GameSpot to say that it has made no announcements about titles supporting the PS4's new preload function, and therefore will not officially confirm whether Watch Dogs--which can currently be preordered for PS4 on the US PlayStation Store--will be one of the first games to make use of the feature. A source has indicated to GameSpot that this will be the case, however.
Original story: The PS4 1.70 update--Sony's biggest firmware release since the console's launch last November--is now available to download.
Alongside the previously detailed features, Sony has also snuck in the ability to change the brightness of the DualShock 4 light bar: you can now set it to bright, medium, or dim from the settings menu. The touchpad, too, can now be used to zip around the on-screen keyboard.
This arrives alongside video editing doodad SHAREfactory, the option to disable HDCP for games, new PlayStation Camera commands, increased broadcasting resolution and archiving support, and the ability to preload games purchased digitally. Ubisoft's Watch Dogs is said to be one of the first games to support preloading, though Sony has not officially announced any titles that will support the new feature.
Elsewhere, Sony has also released the Vita 3.15 update, which makes it easier to connect to a PS4 for Remote Play antics, and updated the mobile PlayStation app.
Sony announced earlier this month that global PlayStation 4 sales are now over seven million, so if everyone decides to update their PS4 today that's probably… a few million gigabytes of bandwidth, I'd imagine.