I don't think they will have a dark green available as an option. But there might be hope, if it is demanded enough.
Black Matte was an experiment Elon Musk was trying out to see if there was any hype for a matte paint job. According to his twitter he will make Matte black an option at launch. So what I'm trying to say is just bombard Elon musk and his engineers with your choice haha.