Oh I forgot to add you also earn cards for 'leveling'. 1-10 you earn your classes basic cards after that you start earning class specific specials. Cards are also graded like loot in WOW, common = white, rares = Blue, epic = purple, legendary = gold.
I'm thinking sooner than that since they are in beta now. More like 1st quarter of 2014. If you havent already, goto your battle.net account and make sure you opt in beta, you might get an invite pretty quick.