Source: us.battle.net
Time to start saving your gold if you don't plan to spend money on the game! For the previous Adventure Expansion, it was worth it to buy with money instead of gold and it looks to be the same this time round. The first wing will not be free for Blackrock Mountain unlike Naxxramas and if you are buying with money, there is a pre-order choice where you can get an exclusive cardback.
Naxxramas featured quite a few staples, from Haunted Creeper to Loatheb, that are used in a lot of decks so I'm guessing you can expect the same for this upcoming expansion. There's probably no skipping if you want to compete competitively for Hearthstone.
