http://www.tomshardware.com/news/microsoft-xbox-event-e3,29378.html
Backwards Compatibility Is Here
Phil Spencer also came out to announce that the Xbox One will finally be able to play Xbox 360 games on its latest console. This has been an issue with the next generation consoles, and with this move, Microsoft is challenging Sony's game streaming service and digital store, both of which provide classic titles from the original PlayStation to the PlayStation 3.
They showed off a classic, Mass Effect, playing on Xbox One. The game performs like it was on Xbox 360, but Xbox Live allows you to take screenshots, stream titles, and DVR your videos via Windows 10. The feature will be available later this holiday season, and as an added bonus, you will not be charged extra for the Xbox 360 games that you already own.