But as was pointed out by someone above, the producers still aren't ruling it out, just suggesting that Flash et al would have to come to them. As for the Supergirl reference, maybe in the universe containing Black lightning, Supergirl is fictional, but in the universe containing the 1990s Flash so are Superman & Batman.
She could always be the Lyla Michaels of a different universe.
Apparently there's going to be multiple versions of Oliver Queen in COIE, all portrayed by Stephen Amell.
- the COIE reference is during the last 40 seconds or so.
Its so weird they are interviewing the cast of Arrow and Emily Bitt Rickards is not there. There were times when I was annoyed with Felicity, but I am going to miss her presence.