The page explains that if you register system as a "primary" system, anyone in your home will be able to play any game you have downloaded to that console. According to Sony, you do not need to log in to the console in order to play these games. The same holds true for not needing to log in for others to use Playstation Plus benefits, such as online multiplayer.
Games you purchase can be downloaded on any Playstation 4, requiring only a sign in to begin a download. You will need to remain logged in and a maximum of two concurrent sign ins can be utilized. The two systems would be the one you designate as your "primary" and one additional console. Sony continues in this section to state that users can enjoy their Playstation Plus benefits on other consoles when roaming, such as online multiplayer.
Sony also mentions the ability to share traditional game discs with no restrictions, as they emphasized in a video poking fun at the feature that was, at the time, not clear on Xbox One.
Sony also mentions the fact that users will be able to utilize the Playstation App for Android and iOS devices, in order to preorder upcoming titles and begin downloads. The article also illustrates that in order to deactivate a console that was dictated as the "primary", it must be done from that console.