Well honestly, if they are a "new" player they will probably be happy to do the storyline quests since they will continue to give you xp, that most of us did not get since we were already level capped. They've already said there will not be a level cap unlock quest. You'll just automatically be uncapped when expansion hits. By the time you hit 50 and do Preatorium, and do the rest of the quests up to the end of 2.55, you'll probably be at least 52.