It's worth nothing that I don't think we've gotten a real pre-order bonus (to the best of my knowledge) ever since....Platinum? IIRC, correct me if I'm wrong here for those who remember, but if you preordered D/P (or Platinum), you would automatically get a Dialga/Palkia stylus and maybe something else I don't remember at the moment.
It's kind of a shame though that there isn't any real bonus for pre-ordering except to ensure that you have a copy by the time the game releases, though. I'm hoping for something maybe like an early event legendary as a gift for those who pre-order early enough, y'know? That would probably get people to care about pre-ordering Pokemon games more. :o