I haven't done a ton of pre-irder on digital, but technically the game cant be sold until midnight, I'd assume you'd just go to the store and do your pickup like any old pre-order and you'd just get a code that you'd have to redeem instead of the actual game.
This is completely contradictory of what I was told when I made the original preorder. :(
Unfortunately I know some people who will... say things... to drive pre-orders, but yeah you wont get the code until tonight. Sorry duder.
Edit: You typically can do a pre-load if you pre-order it via the service it's offered from, liek Steam of Origin.