I know that Ron is with Hermione and Harry is with Ginny but what happened to Luna?

In one interview J.K Rowling did say that Luna did marry a naturalist, but she also said that so many fans asked about Neville and Luna that she sees that they could end up together. J.K Rowling did make a family tree for many of the Harry Potter characters which appears in the documentary "a year in the life of J.K Rowling". Go on www.jkrowling.com and click on eraser and then click on the door handle and then click on the deatheaters sign and it shows the family trees