I too am interested in knowing this.  I pre-ordered regardless (had a giftcard), but I've notice it doesn't state at all if preorder codes are given with online pre-orders.  I called customer service, and they seemed a little confused over the Pre-Order "In-Game Item Code" concept.    I assume it generally doesn't come up often.

However, I see people on the forums asking this question for other games, but not getting any answers.  Someone must have purchased a preorder online for a game with a Promotional code for ingame content at some point?

Cheers