Here's some scoop on Arrow from Entertainment Weekly's Natalie Abrams' The Spoiler Room column, which was posted on 3/10/17.
Is Talia going to appear in present-day Star City on Arrow? — Harry
Yes, and soon! “We will see her in the present day,” EP Marc Guggenheim teases. “What she wants from Oliver in the past is very different from what she wants from him in the present.” And yes, Guggenheim did confirm that Oliver has very purposefully never heard her last name. “Oliver couldn’t have heard it, because if he had, when Ra’s talked about his daughter he’d be like, ‘Yeah, the other daughter, I met her back in Russia,'” the EP says. “We were very cognizant not to retcon anything. So yes, she is Talia al Ghul, but Oliver obviously doesn’t know that.” Here’s hoping seeing her in present day offers an opportunity for him to find out!
Link to the full article:Spoiler Room: Scoop on 'This Is Us,' 'Legends of Tomorrow,' 'Vampire Diaries' and more