We have seen spoiled already several permanent boon titles that will stay with the hero throughout campaign mode. Do you think there will also be boon attachments such as armor and weapons (reminiscent of Hobbit treasures)? I definitely think Sting would be an awesome boon card.
With all of these permanent boon attachments, the heroes are going to get pretty buffed out pretty quickly through the campaigns. That suggests that burdens will have to balance out these "level ups" or the quests will have to get increasingly difficult (or a combination of both).