We don't know yet. In any case I have newer bothered to learn 90% of the personalities of the lords in the Warband anyway because they did basically nothing. All I ever needed to know was the thing about the "dog" in the capture dialogue. So this is certainly not a detail I am going to miss if it will be missing.
Of course if devs manage to make personalities actually do something meaningful and matter in the game mechanic, I would only welcome that.
Yes you could. But only if you have bothered to go to Wiki and learn what answer or reactions belongs to what character type. And because it did not really mater in the grander scheme of things, I really newer bothered. As I said, the only time I wanted to know it was when I had to decide if to release captured lord or not for the +relations. And once I have learned that dishonorable ones always use word dog, that was all I needed to know about whole personality thing.