PS4 Share Play feature during its Gamescom 2014 press conference on Tuesday, a few questions remained as to how it would operate. The "virtual couch" feature allows PlayStation Plus members to play any PS4 game of choice with a friend that doesn't own the game over PSN. As Sony explained to GameSpot, Share Play is limited to 60-minute play sessions, though there's no limit on the number of times friends can play the game.
Planned to launch this fall as part of system software update 2.0 for the console, Share Play will be an inherent feature for any PS4 game, as "there is no need for developers to do anything for their games to be compatible with Share Play," Sony's Shuhei Yoshida told Famitsu (as translated by Kotaku). However, a Sony representative said that the "visitor" that doesn't own the game technically "takes over the host's account," so a friend that's getting a taste of your gaming library is not able to save their play data to their own account. Rather, save files will stay with the hosting player.