While Aquaman ended up as the highest-grossing DC movie of all-time ($1.09 billion worldwide), a sequel has not been officially confirmed, though director James Wan is reportedly in talks to helm a sequel. However, a spinoff surrounding the Trench is reportedly in the works, and Wan has made his first public comments surrounding the underwater sea creatures.
Wan responded to Scott Mendelson of Forbes, who compared a Trench movie to The Nun and Annabelle spinning out of The Conjuring. The director revealed that during Aquaman's early pre-production, he fell in love with the Trench's designs and secretly wanted to explore the world further. However, he added that he is not confirming or denying a possible Trench spinoff.
During the early stages of preproduction, I fell in love with the Trench and its designs... and secretly hoped to explore this world further/more. (Now, I’m not confirming or denying this project ;)— James Wan (@creepypuppet) February 9, 2019
According to those previous reports that Wan refused to confirm or deny, the story would take place in the Kingdom of the Trench but the main cast of Aquaman will not be part of the movie. Noah Gardner and Aidan Fitzgerald have come onboard to write the script, with Wan reportedly attached as a producer.
The Trench is a new creation -- introduced by Geoff Johns and Ivan Reis in the New 52 -- and includes survivors from the sinking of Atlantis who created a home in the Mid-Atlantic. These creatures are more animalistic and attack anyone or anything that enters their home.
Directed by James Wan, Aquaman stars Jason Momoa as Aquaman, Amber Heard as Mera, Patrick Wilson as Orm, Willem Dafoe as Nuidis Vulko, Yahya Abdul-Mateen II as Black Manta, Temuera Morrison as Thomas Curry, Dolph Lundgren as Nereus and Nicole Kidman as Queen Atlanna. The film is now in theaters nationwide.