I pre-ordered a month ago and the release date shipping was $5.98 but when I checked today they've lowered the price to $0.99.
So I looked at my open orders figuring they would automatically adjust mine to the new price.....nope.
If you order Halo Reach from now until release day you'll get the lower shipping price, but if you ordered it months ago like I did it won't automatically update.
So here's how to get it:
Login to amazon.com
Click your account.
View open orders.
Change shipping speed.
Select something other than release date delivery (I chose super free).
Now go back and change your shipping speed to release date delivery.
Click confirm and you'll have $0.99 release date shipping.
They should send you an email confirming your changes. You can also view your invoice to see the new grand total.
I hope this helps someone.