I'm having the same problem with Kings of the North, which is due out on the 22nd. It has long been available for preorder at Amazon and is now also available for preorder from iBooks, and Apple has only had Random House titles for two days!
I even wrote the publisher, but they told me it's up to B&N to offer it for sale, which is the exact opposite of what B&N seems to be saying with their little "tell the publisher" button.
But unfortunately no ebook date yet. George R. R. Martin's "A Dance with Dragons" volume 5 of the Song of Fire and Ice series. Due date July 22.
E-book date is the same as the hardcover: A Dance with Dragons (A Song of Ice and Fire #5), and by the way the correct date is July 12.