Prepare for a community of ageing teens going into orgasms, conniptions and a lather, depending on their relative position on the age scale: the title of the last Harry Potter book has been revealed.
Harry Potter and the Deathly Hallows it is.
Other places where you can expect much good cheer befitting the season (what a clever girl JKR is!):
JKR's own site
Police story coming up, promise. Since I'm at large, we can safely assume the story has a happy ending (which, given the people concerned, might have been in doubt).