Microsoft's Xbox Store was updated today, confirming yesterday's leak that Dark Souls will be coming to Xbox One via backward compatibility.
Furthermore, it confirms that if you pre-order a digital version of Dark Souls 3 on the Xbox Store, you'll get a digital version of the original Dark Souls for free, playable on Xbox One.
Here's the official messaging:
"For a limited time, purchase a digital pre-order of DARK SOULS™ III on the Xbox One Store and get the original Dark Souls playable on Xbox One. The code for Dark Souls will be delivered to your Xbox message center in 7-10 days. You can redeem the code on your Xbox One console or at xbox.com/redeemcode."
There are currently two different editions of Dark Souls 3 available on the store. You can purchase the standard edition for $59.99 or the Deluxe Edition for $84.99; either version appears to come with a free digital copy of Dark Souls for Xbox One.
Dark Souls 3 is set to release on March 24, 2016 in Japan and on April 12, 2016 globally.
