Will Shaman Be Dethroned in Hearthstone's Gadgetzan?

The new Hearthstone expansion, Mean Streets of Gadgetzan, has only just been announced, and we’ve seen less than a quarter of the 132 card set, but I’m already pretty optimistic about the direction it’s taking the game.
I love the idea of multi-class cards (divided into three “gangs” – the Grimy Goons, an alliance of Hunters, Paladins and Warriors; Jade Lotus, comprised of Druids, Rogues and Shamans; and The Kabal, mana-obsessed Mages, Priest and Warlocks), I