The Kickstarter edition contains the base game plus 3 promo packs that will not be included in the retail edition:
Hero Equipment Promo Pack - 6 equipment cards, 1 for each hero in the base game and Sindra & Finkel Expansion.
Events Promo Pack - 26 event cards to shuffle into the monster deck to introduce both positive and negative effects, adding replayability.
Threats & Resistance Promo Pack - 16 cards used to alter difficulty and replayability and also introduces a campaign mode spanning 5-7 games.