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The DC multiverse is a comic book line like no other. The oldest publisher still in the game, they have a good thirty years on their closest competitors – which means they have a good thirty years more classic stories to draw on. Take into account that, unlike Marvel, DC have long since curated a good couple dozen alternate universes alongside their main fictional world (the place where Batman, Superman, Wonder Woman and Ambush Bug all play nice), and that adds a heck of a lot more source material to draw upon.
Warner Bros. will be establishing two separate DC cinematic universes for now on - the DCEU and the rebooted continuity featuring Robert Pattinson's Batman.
I hope they have one universe that is actually consistently dark and mature like the Joker, instead of PG-13 bullshit that is the current universe.
Joker is not officially linked to the DCEU but to DC Black. Films in this category are not directly connected to the main DC cinematic universe but DCEU,
no, far from it. in fact, the complete opposite for me. DCEU is a lost "cash grab" cause.
I'd be totally fine with this being a prequel universe or something along those lines. You could easily involve Wonder Woman, considering she's getting a movie that takes place in 84', a young batman with robin before he died. You could always have a Flashpoint event that creates an alternate universe where the present Clark, Aquaman, and Cyborg go back in time for a Justice League in the 80's film. The possibilities are there, they just need to make the right cards fall in place and HAVE A PLAN.
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I really hope that Gail Simone's Wonder Woman arcs are something that DC takes notes from. That's how you do a comic book heroine.