As we all know (or at least people that play WoW) that Blood Elves will be the new race for the Horde, but what of the Alliance? Post your theories here. My bet is the Worgen, here is a thread that may give evidence to the new race. NOTE: This is not concrete proof:
The people of Gilneas entombed themselves in their isolated peninsula at the outbreak of the Undead Scourge, erecting the Greymane Wall to keep out the demons and walking dead of the cursed army. To this day, refugees from the ravaged villages of Lordaeron gather at it, crying for safe haven from the Forsaken that now claim Silverpine Forest as their own.
Yet it is not much better behind the wall. For agents of the crazed wizard Arugal have infiltrated the once-prosperous land and spread a dark curse among the populace. As the first tainted moon climbed into the sky, screams rendered the countryside as the inhabitants of Gilneas changed forms and became the crazed Worgen. Few retained their minds. Many became wild and bloodthirsty.
Those who remained in control of their thoughts waged a war hidden from the eyes of the rest of the world, slaying former friends and family in an effort to preserve what little life still hoped for survival. Naming themselves the Nightcry after that first terrifying moonrise, they fought until they found themselves drained of resources and the will to continue the bloody battles alone.
Unable to conceal their horrid existence from the world any longer, a new sun rises over Gilneas. The Alliance has opened its gates to the refugees and an effort is now underway to restore humanity to the Nightcry Worgen. As one of their number, you must prove yourself a capable ally to the Alliance's cause and master the powers granted to you against your will in order to free your land...no matter how much blood you must shed.