Harley Quinn I think is this month but they have to give YJ at least one more season. Let the showrunners know this is it so they can make a proper ending you can't end it on that cliff hanger
I could totally be wrong, but I can't think of one DC project that they're working on right now or discussing that isn't live-action. Anything DC related hasn't been announced yet for San Diego Comic Con next month and we still don't know if there will be a DC Fandome this year. If that's the case, then the announcement would likely just come from social media.
If we do get a season 5 though, I don't think it will be 26 episodes nor should it be at this point if we're being honest. Other DC shows aren't getting 26 episodes, so I don't see how Young Justice still will either. The showrunners keep insisting that we aren't a "proper ending" and wants the show to keep going so I wouldn't have my breathe on that one. I think it's stupid logic, but they did it wga