The interview was given by Executive Producer Clive Philips.
And I know for sure that the team doesn't know because this isn't the first time they've said this. When preparing for Season 4 they said they sat in the writers room trying to figure out a way to top Season 3.
They've also said that whenever they have an idea they don't save it. They write to make the best season possible and then worry about making the next season better when it's time to develop the story.

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