I don't know, maybe they are not ready yet. I am curious to see whether we will get a companion for all classes or not at the end. It would make sense for the origin play-style, so you can experience all classes with an origin, on the other hand thats a lot of resources to allocate to create rich story lines for all those heroes. I would be fine with an more neutral and three good character added so we will have 3 evil, 3 neutral and 3 good companion to form our party with.