Xbox One is backward compatible from now. Games, a growing number of your Xbox 360 games on Xbox One - at no extra cost. For fall more than 100 tracks are provided, and hundreds of more games being added every month. Xbox One is now the best place for your Xbox 360 games. Enjoy the best games lineup in the history of Xbox - exclusively on Xbox One. Did I just simply be copied from the official site ;-)
No ... have a thousand times always used to read that it is not so I'm sure;)
No that does not work
Clear is that, you can even Amiga games on the Xbone play! Every now and then it turns even in a flying saucer. But that need years of exercise!