Good news abounds!
Amazon now says The Guide "Usually ships within 3 to 6 weeks," which is code for "Hey, it finally occured to us to order some copies of this book that we've been accepting preorders on for over half a year." My insiders say that they should actually be shipping all preorders in about two weeks.
Amazon customers, please post a comment when and if you get a message from Amazon indicating that the March ship dates were a big, hateful lie, designed to cause strife and keep you from making a movie.
Some enterprising Amazon Marketplace sellers have some copies for sale, some of which are available now. Check out "More Buying Choices" on the Amazon product page.
Barnes & Noble show that they ship The Guide within 24 hours. Rock on, BN.