They have already said you will be able to mod the game including adding your own art if you have the tools and the skill.
I don't think they need to have playable elves, trolls, etc. That would make it a very generic fantasy game indeed.
I'm happy with it as is for the moment, though I may try out new races modded in.
Well, we've seen in the beta that there are already trolls and giant spiders, and we've been told there are going to be dragons... sounds like plutonic fantasy already, to me I don't think it's a legitimate argument to say you want to have an original fantasy setting in a game, exclude race like elves and orcs by that reasoning, and then throw dragons into the game (which have made an appearance in virtually every single fantasy setting ever concieved).
I think elemental needs to go one way or the other, and not halfway. If they want some completely original lore, get rid of the dragons and trolls too.