Ooooh, interesting. That meana we could hypothetically end up with a sim with 10 personality traits, the ones picked during CAS, then several 'aspiration' traits. It means they would grow(mentally/emotionally) and evolve as they complete aspirations and gain traits. I like that idea, as it does somewhat mirror real life. Some people are born natural cooks, some study cooking and become amazing cooks through hard work.
I also noticed in the video that Ryan said Bella was outgoing, yet I haven't noticed that as a trait in sims 3. Perhaps, like creative, it encompasses several traits from sims 3 and makes them into one trait. Such as friendly, charismatic and social butterfly.