Hello The VeggieTales, Well, the expansion pass has 2 DLC's. House of Wolves and The Dark Below. These DLC's will expand the universe and history of the game. [b]Playstation Blog[/b]: ‘brand-new story missions, cooperative activities, competitive multiplayer arenas, and all wealth of all new weapons, armour, and gear to earn’. [b]Bungie[/b]: “Expand your Destiny adventure with brand new story missions, cooperative activities, competitive multiplayer arenas, and all wealth of all new weapons, armor, and gear to earn. The Destiny Expansion Pass includes Destiny Expansion I: ‘The Dark Below’ and Destiny Expansion II: ‘House of Wolves.’ In ‘The Dark Below,’ you’ll discover an ancient tomb has been unsealed. Beneath the surface of the Moon, a dark god has answered centuries of prayer, and a dark army has risen. Explore the true depths of the Hellmouth. Stop the dark Hive ritual and survive.” Each DLC can be bought separately for $19,99, the expansion pass is (I believe) $34.99$ and if you buy the Digital Guardian Edition it would cost you 30$. And yes, it can be bought later. Hope it helps, Cheers!

They are add ons to the story They come with more armor and weapons & possible multiplayer maps You can buy it at a later time if you desire They also have playstation exclusive parts in them