I just received this via email:
Dear Commander,
Frontier Developments has just announced the release of Elite: Dangerous exclusively on Xbox One in the Game Preview Program.
As a token of our appreciation for your continued support with the development of Elite: Dangerous we are delighted to be offering a £5 Gift Code, redeemable only on the Frontier Store, for customers who have purchased the game and who purchase Elite: Dangerous on Xbox One.
An e-mail will be sent to your registered email address with the Gift Coupon after you have purchased Elite: Dangerous on Xbox One and linked your accounts.
We hope you enjoy the Elite: Dangerous experience on Xbox One!
Fly Safe Commanders!
The Frontier Team