Based on the mind numbingly awful campaign, it'll be that chick who rules Pariden.
She is:
super magical
reclusive
angry at the hero
a chick
That's pretty much all you need to speculate her into the foozle.
I'm kind of hoping I'm wrong, and that all the lore from that campaign will be burned in a firey fire of doom somewhere, with something new, simple and less friggen "yay multiculturalism let's all work together to fight the strange black people from far away" in its place.
Yeah, ok, so they summoned a demon or a dragon or something. Considering the atrocities committed throughout the actual gameplay, it'd be nice to remove the pseudo good v evil stuff (yeah it's not formally in there, it's just everything but) and focus on them co-existing uneasily in a post-apocalyptic wilderness where, yes, it's ok to be some kind of freakish undead ghoul thing so long as you don't try to steal my porridge in which case I'll shank you, your mom and all your kids. More Victorian Great Game, less white knighting.
You know how refreshing that would be? Damned refreshing.