Bungie has started releasing Xbox One codes for the Destiny Beta for those who pre-ordered the game. If you haven’t had an email containing the codes, simply log in at http://www.bungie.net and go to PROFILE>CODES
If you have codes, share ’em. If you have a code, download the game. If you have the game, share it. All embargoes are lifted. Beta is live!
— Bungie (@Bungie) July 22, 2014
Destiny is still available for pre-order.