Well, that was certainly quick. The highly anticipated new set 10188 Death Star is now available for preorder from the LEGO Shop online.
3,803 pieces. 399.99 USD. Ships on September 16, 2008.
EDIT: Jesus Diaz over at Gizmodo has the full list of minifigs and features. What the heck is a Phlutdroid? Oh, I see.