I asked Amazon recently and they gave their generic response of how they will post items as they become available - but it was already listed as coming out on 9/9 by several sites. Amazon is up to something here.
Sept. 9th has been listed for weeks as the Blu-Ray release date but all Amazon has had are foreign versions or digital. I emailed them and got essentially a "no-response" response. Something's definitely up between Amazon and the Mouse.