Прочитал на реддите, что подобные баджи есть у всех, чья компания представлена на E3. Баджи эксгибитора есть, например, у Gamespot и Giant Bomb. Эд Бун мог его получить просто как сотрудник WB:
Exhibitor badges aren't only for people presenting games. Anyone who works for a company who is presenting at E3 can have an exhibitor badge. For example, Jeff Gerstmann and the Giant Bomb crew all have exhibitor badges, because their sister site GameSpot has a stage show at E3, so all GameSpot, Giant Bomb and Cnet staff can get exhibitor badges, even though the vast majority of them aren't exhibiting anything at the show.
That's not to say this couldn't be the announcement embargoed until the middle of E3, but the exhibitor badge isn't evidence of this. Warner Bros. are exhibiting games, and all WB employees attending will have exhibitor badges.