If you've been holding your breath waiting for the latest news on Hearthstone: Heroes of Warcraft, you can stop now because Blizzard's just released information about the game's crafting system. Instead of a traditional TCG (or trading card game), Hearthstone styles itself a CCG (or collectable card game) -- which means no trading. So what do you do to get the cards you want if you can't trade for them? Craft!
The crafting system is a lot like WoW's enchanting system: if you have cards you don't want, you can disenchant them to get Arcane Dust. Then you can take that and use it to craft new cards or improve old ones. Of course there's a catch: cards disenchant into far fewer Arcane Dust than is required to make new cards, but, still, this sounds like a system that will make getting the cards you want a lot more achievable than buying or trading for the ultra-rare cards that you really want.
P.S. We hope none of you are actually holding your breath for Hearthstone updates. With the speed of news updates, that's definitely bad for your health.