It says on the side of the page that the album will be available on September 14, 2010.
When Amazon had Korn III listed, it also had the "Original Release Date" six days before the release but on the side it said the actual release (July 13, if I remember correctly).
They didn't release Korn III on July 7th. They're not releasing A Thousand Suns on the September 8th.
Edit: Though I would love to be proven wrong.