For the love of god, people need to stop saying this. "New content" just means new shit you can do that you currently can't do. It doesn't mean it has to be truly new. Blizzard uses "new content" to describe every single thing they add to the game. You will NEVER see an interview or press release that says anything they're releasing is anything but "new content" because people would get upset if they said they're working on revamped content. WotLK naxx was new content. Heroic dungeons were new content. Challenge modes were new content. Cataclysm questing updates to old zones were new content. Scaled versions of old dungeons/raid would be new content.