I'm afraid that your first question will only be answered when we get another official update - nobody here can tell you anything other than what people have guessed based on foreign news.
In Alpha testing and in the Korean CB, there were only four classes, yes. But concept art and a shop in-game hint at other classes that haven't been implemented yet, such as Dollmaster and Hunter.
Oh, and be prepared for a lot of negative reactions to your post. Thought I'd get in here and give you a sensible answer before everyone else jumped on you for asking this question again ^^