There's no release date shipping option because the release date isnt known yet. After the announcement they will most likely automatically switch prime members over and email others to let them know they can do the same.
Try refusing delivery. If you're home when the delivery guy comes tell him you want to refuse one package or leave him a note. If both items came in the same box you may be out of luck though.
So are people actually ever able to buy from here? I tried to purchase gw2 and kept getting redirect errors. Tried more than one browser and more than one payment method.