Details are at the link: [url]https://www.bungie.net/7_Where-can-I-get-info-about-the-Destiny-next-gen-di/en/Help/Article/12122[/url] For your questions though: [quote]I own Destiny for Xbox 360.[/quote] Is it a digital copy of the game? [quote]If I buy the The Dark Below Expansion, will I get a free copy of Destiny for my Xbox One?[/quote] Only if you purchase the expansion on Xbox 360, you will get the upgrade for free on Xbox One. If you purchase it for Xbox One, you will need to purchase it again for Xbox 360 if you're planning on switching back later on. My advice would be to purchase it for Xbox 360. [quote]Do I just get the expansion that I bought for free? Do I get both? [/quote] Not sure what you mean here. If you purchase the expansion Xbox 360, you will get the Xbox One version for free. If you purchase the expansion on Xbox One, you will have to purchase the Xbox 360 if you plan on playing it later on.