Based on what I read directly on Amazon, including the "official" response to the person asking about the preorder codes and what I can gleam from people talking about their interaction with the cs reps, my guess would be that the reps just simply have no idea what the preorder code is and believe it to be a separate thing or product that differs from preordering the expansion.
However this conclusion is just my opinion based on previous experiences preordering games through Amazon including the release of 2.0 as well as the way the responses came off to me.
If you are worried about not getting the preorder code and items and don't feel obligated to get the game through Amazon then definitely get it directly through the SE store.
Edit: yep, I read that exact response and it comes off as confused to me, as if the official responder doesn't really know what the preorder code is and believes it to be a different product or service, not a code that comes with the game as a bonus.
Would be nice to get a response from a SE rep on the situation with preordering from 3rd party sellers like Amazon.
