User blog comment:Jimeee/Elder Scrolls Online will be subscription based/@comment-131.193.238.148-20130822161220/@comment-67.171.88.45-20130823004723

But the developer can choose to not require playstation plus for their game so if zos is smart they will go with that to encourage more people to play their game. Of course playstaion plus is a pretty good deal for the cost anyway so most players will have it regardless anyway.