Xbox Live gold members can download the Final Stand DLC for Battlefield 4 beginning on May 18. This is part of the Road to Battlefield promotion that saw DLC for Battlefield Hardline and Battlefield 4 previously released. The date for Final Stand was outed by a posting on the Xbox One community calendar.
Electronics Arts previously mentioned that all DLC released through this promotion will be available on all platforms, so presumably Xbox 360, PlayStation 3, PlayStation 4, and PC will also be receiving the Final Stand DLC during this time frame. The last giveaway lasted for a full week from May 3 through May 10.