While attending Planet Comicon in Kansas City this past weekend, Stephen Amell told fans that the plan for the currently untitled, Arrow/Flash spinoff is for the show to "launch midseason next year." Currently, the show is confirmed to star one-half of Firestorm (Victor Garber), Canary 1.0 (Caity Lotz), the Atom (Brandon Routh), Captain Cold (Wentworth Miller) with casting currently underway for three additional DC Comics superheroes rumored to 'POSSIBLY' be Booster Gold, Static Shock and/or Fire.
A second interesting revelation from Amell, was his statement that the coolest moment in the show's history will be the trailer for season 4 that will be released at SDCC 2015. They haven't filmed it yet, obviously, but Amell knows the direction the show is heading. Said Amell to fans in attendance, "Without spoiling anything, I will say, I think the greatest moment in the history of the show will be the trailer that we show at Comic-Con this year. I really do, because after three seasons and 69 episodes, we are going to fundamentally change the show at the grassroots level. I think it's going to be cool."
Amell also teased that the show is currently filming what may be the end of the Diggle/Oliver bromance. "There are things happening in the episodes that we're filming right now that are going to alter Oliver and Diggle's relationship forever." With Oliver and Diggle currently as close as brothers, it stands to reason that the biggest change in their dynamic would be for them to grow apart or even become adversaries. It's also been strongly rumored that SPOILER:[ Diggle's wife, Lyla will be killed in an upcoming episode by the League of Assassins] so that could be the catalyst for the shift in their dynamic. Amell jokingly added, "No, it's not Diggle becoming Green Lantern."