Unfortunately, I don't know about the hairstyles. It's never been a big concern to me.

However, based solely on my memory -- which is maybe not the best source -- I seem to remember that when YoshiP first started, he said that there would be new race and style choices, and he wanted to give the current players the option to choose a new race when they became available. However, I also remember something more recently that made me think they might not be able to do it. (This is all just my interpretation based on memory, though.)

But I think one of the many interviews included the devs saying that they would eventually implement a barber's shop, so players could change their hairstyle. But that it wouldn't be coming for quite a while yet.