There's some more post ep interviews here though I don't think they really reveal much
The Flash - Episode 2.05 - The Darkness and the Light - Promo + Post Mortem Interviews | Spoilers
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First and foremost, executive producer Andrew Kreisberg confirms that Wally West is Joe’s (Jesse L. Martin) son that Francine had after she left Central City, which makes things even more complicated for Iris. “Iris is now in the position that Barry [Grant Gustin] was in last year, she’s keeping a secret to protect somebody,” Kreisberg says. “She’s going to find that for all of her anger at Barry and Joe from last year, keeping this secret is not going to be so easy. It’s going to be weighing on her before she finally decides to take some action in an upcoming episode.”
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Not here for them comparing Iris's secret to what Barry & Joe did last year.