I know I have heard that depending upon you package choice you will have a choice between a collection of souls with various affinities at startup that you can choose from. Kings and the like will have more available souls to choose from to get the one they like best while the lower tiers have fewer.
In the past when I heard souls affinities described though I never heard of it relating to the soul being particularly good or evil though, I had heard the affinity was toward certain tasks and that the affinity would increase from lifetime to lifetime as the soul was passed on and reborn, allowing people to master a craft or profession to greater and greater heights as they followed their families generational path. If a tendency toward good or evil is linked to soul affinity that would be interesting, and ultimately I think a tad limiting since players choices would almost be preset and the game want to push for a heavy free-choice feel. The details of how the engine will run are still largely shrouded in mystery.