Hmmm... we've been having this debate on a SFF forum for some time. And we've got three camps - those who think Harry will live happily ever after, those who think that Harry and Voldemort will end everything and each other (I'm in this camp), and those that think that JK might go the way that Arthur Conan Doyle originally did with Sherlock Holmes, and do Harry in, in a way that doesn't actually kill him (Holmes and his nemesis were grappling o top of a big waterfall and both fell off and down into the darkness. We weren't told that either died. As it was, public demand made Doyle begin writing Holmes again some years later - so Holmes didn't actually die after his plunge).

Btw, JK has hinted that the two-way mirrors Sirius gave Harry play a part in book 7, and the American cover seems to show that the room with the podium from Book 5 features (as far as I know, the American covers act as spoilers - I've been told that they certaintly have done for the past 6 books. British covers do to a degree, too).