Madden NFL 15 appears to be the first Pre-Purchase game available on Xbox One. It also features a discount if you are subscribed to the EA Access Service. It’s playable for 6 hours on pre-purchase till it’s actual release.
The site details are:
XBOX ONE GAME EXPECTED TO RELEASE ON 29/08/2014. YOU MAY DOWNLOAD THE GAME FROM XBOX LIVE BEFORE THEN, BUT IT WILL NOT BE PLAYABLE UNTIL 12:01 AM BST ON THE RELEASE DATE. Once purchase is complete, download this game by selecting the “Manage” button on the product details page on your console. To get 10% off your purchase and an exclusive trial five days before the release date, you’ll need to sign up for EA Access before you pre-purchase Madden NFL 15. This includes the standard edition of Madden NFL 15 plus the Pre-order Bundle in Ultimate Team, which is comprised of 11 Pro Packs (distributed 3 packs week 1 and then 2 packs per week for the next 4 weeks).