It seems that Blizzard concentrates a lot on the Warcraft series, spawning 3 RTS games, World of Warcraft MMO, and now, hearthstone CCG. For myself, I'm more of a fan of Starcraft than anything, so it would be pretty damn awesome if there were more games based on the Starcraft universe, like a "World of Starcraft" MMO or some kind of CCG... 

Check out the designs for these cards from Fulla:

Zerg Cards

Terran Cards