i've had an email from amazon saying that the code will be sent out on 30th September. I also remember reading this one the site too about a month ago when the pre-order bonus was still being advertised. I think it must be because the release date was brought forward.
Got the email saying the DLC content wasn't yet available but that i should already have my code and not to use it. the only thing though...THEY FORGET TO EMAIL ME MY CODE. WTF. every time i pre-order on here i end up having to fight with support to get it. bloody amateurs!!