On the Xbox One store page for Fallout 4 the description has revealed that until February 8, 2015, those who purchase Fallout 4 will have access to a free digital copy of Fallout 3. This deal was originally announced at Microsoft’s press conference at E3, and currently the Xbox.com store only states the deal is, “For a limited time.” The full text on the Xbox One is as follows,
Through February 8, 2016, purchase Fallout 4 and receive Fallout 3 on Xbox 360. The code for Fallout 3 will be delivered to your Xbox message center in 7-10 days. Redeem your code on Xbox One or Xbox.com. Fallout 3 will be backward compatible so you can play it on Xbox ONe starting November 12.