Warning. FULL SPOILERS for Arrow Season 6 below.
At Comic-Con 2018, the CW revealed a new trailer for Season 7 of Arrow, showing a somber-looking Oliver imprisoned after the events of the Season 6 finale. You can check out the trailer below:
During the Panel, Stephen Amell foreshadowed the trials that Oliver will have to endure in “prison with a bunch of people that he put in prison.” Amell said this is going to be a much darker version of the titular hero, because “There’s nothing heroic about him at all,” Amell said, adding, “I really hope the premiere really pisses you off.”
Source: IGN.com Oliver Takes the Fight to Prison in Arrow Season 7