Ramsey on the mid-season finale.. "Dexter, they had this huge cliffhanger at the end of one of the seasons where they killed off [Dexter's wife] Rita…It’s going to be bigger than that,Huge."
Diggle's thoughts on Helena & Oliver's blossoming new relationship.. “It’s going to be somewhat contentious between Diggle and Oliver because of her presence in his life,” he says. “Diggle has some very strong feelings about who Helena is and so does Oliver. And they won’t see eye-to-eye. It’s going to cause some difficulties, and I think this comes from Diggle seeing things in a way Oliver doesn’t.”
More on Diggle's back-story.. An upcoming episode will see Diggle’s backstory “come to life” as we will learn new information surrounding the death of his brother, who was killed by an assassin.“Viewers will see more of Diggle’s backstory and you’re going to see more of what his relationship with Oliver means to his own family.”
Source : EW