Scholastic has confirmed that the American edition of Harry Potter and the Deathly Hallows will be 784 pages long. This makes the 7th installment longer than Goblet of Fire but shorter than Order of the Phoenix.
FYI - the inital print run of DH is 12 million copies and "will be printed on paper that contains a minimum of 30% post-consumer waster (pcw) fiber"
Only 122 days to go!!!!