I just thought of something, when I was reading what michelle.h wrote (and sorry if this is off topic) but Dumbledor left his pensive behind. I think. If he did it might help in learning more about voldemort. Or Snape. (But I'm not saying Dumbledor's gone, just out of the picture. For now.)
And yah I also think J.K.'s going to dazzle us all with a way to tie up all the loose ends in one last book. And still be able to finish the story. But we still won't know how it is untill we read it. Speaking of which, when will the book come out?