User blog comment:Crazy sam10/Call of Duty: Advanced Warfare Day Zero edition/@comment-402843-20140812141358/@comment-1187559-20140813062050

According to the FAQs, if you have a disc version on pre-order, you can buy the game that 1 day earlier. However it is subject to availability, so if the shop runs out of discs then you don't get it. But I think they mentioned you still get a code to unlock all the stuff you should have unlocked.