I would rather see a new campaign instead of DLC. Imagine a whole new campaign with level 1 characters again. They could reuse the same engine and maybe even a lot of the art. The majority of the work would be the story and voice acting. You just create a whole new scenario and let the players go at it. This would be not so much as DLC or expansion. They would need to charge a fair price, $30 sounds about right. The turn around time would be quicker than developing another game for the new campaign.
