im not sure....... but right now i have a feeling that luna and harry will just remain friends if anything will happen between them it will happen when thier both older (but i doubt it!).
i also think that luna and harry have a lot in common (not somthing thats going to bring them together romanticaly) but somthing that will make them bound as friends, i think that luna and harry have both been deeply hurt more than once in thier lives and it will be a good chance for them to talk about it with somone who REALLY knows how they feel.