[quote name='dmdragon']I was told by CS that if you have amazon prime 2 day shipping it will be automatically upgraded to release day shipping closer to release. I called since I could have sword I had read that somewhere.[/QUOTE]
I've had that happen before with Muramasa and again with Uncharted. They auto-upgraded me to Release Day a bit before the game came out. In those cases though, the games were in their own solitary orders, so I'm not sure if my Assassin's Creed 2 would upgrade since it's stuck with two other games. I say this mainly because whenever I had a large order and one game already had Release Day available, it would usually appear separately from the rest of the order on the checkout page, and actually given its own separate order number.
I've also had the same experience as Lorddraco with asking CS to upgrade. They either can't or won't do it. Heck, on their own Help page for Release-day shipping this is what they have to say regarding changing your order:
"If you do need to change your order, we recommend placing a new pre-order for the item and then cancelling your previous order after you are sure you can choose Release-Date Delivery on the new order."