Blizzard needs more time to finish up Hearthstone: Heroes of Warcraft. The developer announced today that they've delayed the start of the open beta until next year.
via N4G: pc news feed http://n4g.com/news/1416623/hearthstone-open-beta-delayed-to-2014
via N4G: pc news feed http://n4g.com/news/1416623/hearthstone-open-beta-delayed-to-2014