Can my son play Minecraft with his XBOX 360 friends with his XBOX One? [duplicate]
It is currently not possible. Backwards compatibility is only for these games:
http://www.xbox.com/en-US/xbox-one/backward-compatibility/available-games
If MS makes the 360 version of Minecraft backwards compatible, it will be possible. But then you'll have to buy the XBox 360 version of the game to play on your XBox One.