Re: Batman Beyond?
I'd prefer a solo Bat film with Bruce, we need a comics/BTAS/Arkham City accurate Batman in a solo film before Batman Beyond. BUT, I am fine with young Bruce being in JL and Terry being Batman in Beyond. I LOVE Batman Beyond, I've been rewatching it lately, it's a great show, and I completely support a live action film.
As for villains, the greatest Batman Beyond story they ever did was Return of the Joker, I say they adapt that, while combining Terrys origin into the story