From The Scotsman: "Strict security measures are being put in place by Bloomsbury to ensure that the secrets of" Harry Potter and the Deathly Hallows "are not leaked." Copies "will be delivered to shops just one day before it is due to go on sale on July 21 and will be carried in crates bound with steel chains. Security guards will also been deployed in printing plants and online bookshop Amazon has agreed to store its copies in warehouses at secret locations."
I'll still be shocked if the surprises of this book stay under wraps until the release (crates and steel chains notwithstanding); thankfully I'll be on vacation the week before and am hoping to avoid hearing the news until I can read the book.