Passions, Traits, Relationships - things which you believe in, people who care about you - all things which can and probably should affect how you perform tasks where they're involved. Stunts for all sorts of skills, Aspects that can add bonuses, and so on. Though given the emphasis on incorporating ideas from all editions of D&D, I'm pretty certain they're not going to look outside D&D for ideas from other RPGs, no matter how valuable they might be.
I think you're really on to something here but how do they add this while still maintaining that DnD feel? I think the mechanical benefit to these things will encourage buy in across a wider player base too.