Except it wasn't a concept? It was actually in the game. E3 gameplay is supposed to reveal what the developers are working on for the game that is to be released, to get people to buy it, or build hype. If those things weren't going to be shipped with the original game, then why show these things and why have them in the game and being used, an entire year before the game is released, and 2 years before that "DLC" was released?