Battlefield 4's second DLC pack, Second Assault, is already confirmed to launch on Xbox One first. The news, however, is that the pack will actually launch with the new console.
Videogamer apparently got a confirmation from an EA UK spokesperson about the news. The DLC pack is to be made available for download on Xbox One November 22, the console's launch date.
A launch date for other platforms is yet to be set, but you will get your first look at the DLC containing updated Battlefield 3 maps in an upcoming tournament held in London November 1. The tournament will pit a team from Europe against a team from the US, with 32 players each. It will be live-streamed at at 10:00AM PDT .