i could not find any topic on this point, and i would think that it is indeed an important issue. since we would mis out on a lot of content if it's not possible, or we would be forced to create multiple characters and level them to max level in order to experience this.
now don't get me wrong, i plan to play this game (as it stands now) for a long time to come, simply to experience all lore, content, dungeons, different people, different classes etc.
thanks for reading,
cheers \m/