Battlefield 1 was created by DICE, with them talking about concepts for a new game. The speaker on stage wasn’t happy with the idea but they kept pushing the idea with a great pitch.
So, he approved the concept and is the reason by Battlefield 1 is set in World War I.
When the trailer goes live, we will update this article with the trailer released. A live stream for the game with its multiplayer mode lasting a full hour after the event.