The Xbox One Won't Play 360 Games – Even Digitally
 

If you are expecting the Xbox One to be backwards compatible, you are going to be sorely disappointed. Not only will the new Xbox not play disks from the 360 or the original, it will not even be compatible with downloaded games. This means that the nearly 1,000 games currently available for the Xbox 360 will be unavailable to Xbox One users, and it instantly puts the Xbox One's library at a significant disadvantage compared to what the PlayStation 4 is capable of.

http://www.hardocp.com/news/2013/05/...ven_digitally/