Last Harry Potter Book Pre-Order

Amazon has opened pre-ordering for the the final chapter in the Harry Potter saga, and is offering up a pretty good deal, $18.89 for the hardcover which will list at $34.99, and $39.00 for the Deluxe edition which will list at $65.00. What's the difference? Well previous Deluxe Editions have had slipcases, special art on the endpapers, and a poster. Amazon doesn't give any detail as to what