"Zoom’s identity has been revealed: He is Hunter Zolomon, a.k.a JayGarrick. How all of that plays out and what’s actually happening, we’ll leave for after the break, but we wanted to go out on this run of episodes with a big reveal, just the same way we did at the end of episode 9 in season 1, where we revealed that Harrison Wells was the man in the yellow suit. Zoom’s identity is finally revealed. For us, it could only happen because of what happened last season. For Barry and the others, as much as they were stung by Wells/Thawne’s betrayal, he had been their mentor and friend and they all felt that vacuum when he was gone. Jay had been watching them and knew that so he was able to masterfully step into the role each of them needed. He became a friend and mentor to Barry. A love interest to the heartbroken Caitlin. He skillfully played them all."
We'll be learning the truth about Jay Garrick as the season progresses," he tells us. "Some of what he told Barry and the team was true and some of it was misleading."
The question remains: Who is the man in the iron mask, who tapped out the message “Jay” to Barry and Jesse (Violett Beane)? Sorry, Kreisberg is staying mum on the mystery man locked up in Zoom’s lair. “Just when we solve one mystery, we like to set up another one,” he says coyly. “The identity of the man in the [iron] mask is, in some ways, probably an even bigger surprise than this one, if you can imagine it. It’s a new mystery to pull you through the season. Barry swore he wasn’t going to leave him behind. Something tells me Barry’s going to make good on that promise.”