Board Thread:Questions and Answers Forum/@comment-217.23.229.99-20150625103815/@comment-24057866-20150625155010

If the Xbox One was made backwards compatible with the Xbox 360 version of Destiny, that would mean that you could play your Xbox 360 Destiny on your Xbox One with other Xbox 360 players. It's the same game, so it will use all of the same features, graphics, and servers. You would still need an Xbox One version of Destiny to play with users on Xbox One.

You could technically play with other Xbox One players using the 360 version of Destiny, but only if those Xbox One players are also using their 360 versions of Destiny.

All that said, I doubt Microsoft will make 360 Destiny backwards compatible because the game is already available on Xbox One. They'll probably stick to making only previous-gen games backwards compatible.