If you pre-order the game direct from THQ you get a season pass for all 3 DLC's for free (30 day, 60, and 90 day DLC). Other retailers only offer the 1st DLC for free with a pre-order.
http://shop.thq.com/store/thqworld/en_US/pd/Darksiders%C2%AE_II/productID.241233400/categoryId.57907600