The potential for an encounter between Vigilante Joker and Harley Quinn.
It seems strongly hinted at that Waller will be using members of the Pact against Batman and Joker in the Vigilante version of the episode. I think there's potential for an emotional encounter between John and Harley which I think will be really awesome! I think it's pretty clear that John is still in love with her as what can push him to be a Villain is Bruce endangering Harley's life. He only stands by you if you trust him to bring her in unharmed. Of course Harley probably won't be pleased to see John and might be happy to (in her mind) give the two timing traitor what he deserves but I think it could still be exciting and emotional.
How do you think a possible encounter between Vigilante Joker and Harley might go down? Please share your thoughts! ^_^