Are there plans to add low and mid-level Sagas to the game (for existing quests)?

For example, will there be a Korthos Saga, perhaps two or three Harbor quest Sagas (get rid of all the Kobolds in the storm sewers perhaps), and one or two Sagas for quests in each of the houses plus others for the other adventure packs (or spanning more than one pack even)?

If there are plans to add them, any rough time-line for when they might show up?