One thing that has been confirmed by Rowling on the Pottermore site was my suspicion that McGonagall isn't married. Apparently she was in love with a muggle when she was 18, but as a half-blood, she had seen the problems inherent in her own parents' marriage and turned down her suitor after already agreeing to marry him, thus breaking both her own heart and his. Why she then didn't find a suitable wizard to marry after that is anyone's guess.

I have wondered before whether any of the faculty at Hogwarts are married/partnered. Rowling just never says one way or another, and part of that might be because all the stories are written more or less from Harry's point of view, and he never bothers wondering. But it's not like she doesn't marry off other characters. The teachers, OTOH? Seem condemned to be aging bachelors and spinsters.

ETA: Okay, I'm gonna shut up before drawing conclusions about what is and isn't the case with certain characters based on what I've read. Because as it turns out there may be more to come later that sheds new light on the subject.

Still, I wonder what effect Pottermore is going to have on fan fiction or if it will have any effect at all (i.e., writers ignoring "new canon").