LP FRET12, from what I saw you will. If you got it for a console, I saw that you do get the ten dollar gift card, as well as the psycho pack. From what I got, they'll email you the code "within two business days" of when it's shipped to you. So, there's the good chance you'll get it as well.

do you think the preorders will just let you get the stuff early and you can earn the items later on through normal play or do you think it will be the ONLY way to get the stuff

Pre-Order items CAN NOT be unlocked in the game. And there are no plans for selling them as DLC later on either, currently.