PS4 doesn't restrict used games or require an online connection

PlayStation 4 will impose no new restrictions on used games, and you don't have to be online to play it. Sony Computer Entertainment America CEO Jack Tretton grinned onstage at Sony's E3 press conference as he countered many gamer's greatest concerns with the next generation.

"We believe in the model that people embrace today with PlayStation 3, and continue to demand," Tretton said.

Users who purchase a disc-based game keep the rights to that game: they can trade it in at retail, lend it to a friend, or keep it forever.

And they'll be able to play single-player games offline forever--no 24 hour window like Xbox One. The gauntlet has been dropped.