The Xbox One Backward Compatibility Beta is available starting June 15 for Xbox preview members. The program will launch broadly in later in 2015.
It’s really easy to use too! The digital titles that you own and are part of the Back Compat game catalog will automatically show up in the “Ready to Install” section on your Xbox One. For disc-based games that are a part of the Back Compat game catalog, simply insert the disc and the console will begin downloading the game to your hard drive. After the game has finished downloading, you will still need to keep the game disc in the drive to play.