I watched the extra features in the Half-Blood prince DVD with the 2 hour interview with J.K. It's really funny because the interviewer asked about the marriages and families of all the characters later on. She gave a bunch of details that were not in the book. So the interviewer says "Well, all that could be a whole other book you could write now!"... there's a long pause and very pensive look on her face and she then says "Don't... don't say that..." Because she seriously wants to be done with it all and move on from Harry Potter. But I personally would give my right arm to have a whole other book with everyone's after stories :)
I hope she does end up doing an eighth book!!!!! I am a H.P. FANATIC!!!!! I am on the last book right now and I'm worried about what i'm gonna do when i'm done!!!!
A friend of mine told me that she did write an 8th book, but that there are only 5 copies in the world!!!!They are also supposedly fully illustrated She has one for her family, a friend, and the others were sold for some millions. Now I have a new goal for life: to own on of those