Not PS+ but Sony is considering Online Pass (for used games):
http://www.gamesindustry.biz/articl...online-pass-equivalent-for-first-party-titles
http://www.gamesindustry.biz/articl...online-pass-equivalent-for-first-party-titles
Sony has told GamesIndustry.biz that it supports publisher initiatives to monetise second hand games consumers through online play, and that it is currently investing in a solution for its own first-party titles.
The move has been pioneered by Electronics with Project $10 and refined through the Online Pass, which charges those that buy games second hand to access online multiplayer services, helping publishers recoup some money in the controversial pre-owned market.