Through the magic of backwards compatibility.
If you’re on Xbox One and decide to pre-order Deus Ex: Mankind Divided, then you’ll receive a free copy of Deus Ex: Human Revolution in the process. This is the Xbox 360 version of the game which will be playable through backwards compatibility. The game was recently added to the list of backwards compatible Xbox 360 titles on the Xbox One, making it the first multi-disc title for the same. This version of Human Revolution will also include The Missing Link DLC.
Codes for both Human Revolution and The Missing Link will be released 7 to 10 days after you pre-order via Xbox Live messages. It should be noted this is a limited time offer though for how long hasn’t been specified.
Deus Ex: Mankind Divided is slated to release this August for Xbox One, PS4 and PC after being delayed from its initial February 2016 date. It takes place two years after the events of Human Revolution so if you’re new to the series and on Xbox One, this offer isn’t a bad way to catch up on the franchise.