I just kind of think that Alleria a seemingly normal elven hunter learning to use the void as her weapon as hinted at by the dialogue on the front page could open up the possibility of a new hero class - people seem to be super hyped on tinkers at the moment and generally adding new specs to old classes doesn't make a lot of sense (Shaman and warlock tanks real?!!) I think this is by far a more likely outcome.
Much like in the way shadow priests tap in to the void because of their artefact if our players can some how learn to use the void much like we learnt how to become monks when Panda's left the wandering isles we could get some really interesting specs.
In honesty I think it would likely be a two class spec, a ranged bow using class championed by alleria - I guess it would be akin to shadow hunters, void arrows and volleys - I probably just make it sound like a purple hunter but then again I don't claim to be a class designer, the other spec would likely be a melee void class using void tendrils, teleports void tears as like a dot or something.
I don't really know - it just seems like an interesting idea given what's happened to alleria and a more likely class than tinkers