User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-81.157.124.69-20130401171319/@comment-60.229.35.51-20130402032441

They would have to sacrifce some single player content to put it in. It would be a bad idea. Those who want multiplayer should just get ESO.