There are 18 different decks, one for each class and faction combination (9 original classes, Death Knights aren't represented). Each deck is playable out of the box, 60 cards + Hero. Packaged along with each deck is a rules sheet and a crafting card and the possibility of a loot card. A majority of the cards are reprinted from previous expansions, however there are some new quests and unique allies included in each deck.
Look for popular loot cards from the games first several expansions (including the Spectral Tiger!).
10 class decks per box, 6 boxes per case.