Aquaman had a poster that said, "Unite the Seven," a long time ago. The seven kingdoms of Atlantis: Trench, Brine, Xebellian, the Fisherman kingdom, the Atlanteans, the Deserters, and a long-lost kingdom were misinterpreted by fans as seven members of the Justice League. That's right, the "Lost Kingdom."
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Even more than the first picture, Aquaman and the Lost Kingdom appears to be about Arthur wanting to unite all of the ocean kingdoms while also learning more about why this one kingdom was lost.
You can also expect to hear something about something else going on in the DC Universe. We have no idea what this signifies after Zack Snyder's Justice League. Shazam, on the other hand, is out there. By the time this picture is released, Black Adam will have joined them. Who knows? There's also The Suicide Squad and Wonder Woman.
Director James Wan is aware of the situation. And on December 16, 2022, he'll release Aquaman and the Lost Kingdom in theatres.