Aquaman and the Lost Kingdom is set to arrive in December 2023, and details about the upcoming DCEU project have started to be released. Jason Momoa made his debut as Arthur Curry, a.k.a. Aquaman, in 2017's Justice League, before starring in his first DCEU solo film, released a year later. Aquaman attained huge box office success and critical acclaim, exploring Curry's backstory and his claim to the throne of Atlantis in fascinating detail. Momoa would make a later appearance in 2021's Zack Snyder's Justice League, but his story will continue properly in the upcoming sequel, as the Aquaman and the Lost Kingdom trailer makes it clear that a lot has changed for Arthur Curry since his last solo film installment.
https://screenrant.com/aquaman-2-lost-kingdom-trailer-story-release-date-news/