Since the movie will be released in 2022, don't expect the trailer until late 2021. Meanwhile, as for the cast of
Aquaman 2, Jason Momoa will of course return as Arthur Curry/Aquaman. The actor has been keen for the sequel, and he pitched an idea for it while still shooting the first movie. Other cast members to join Momoa in the sequel includes Amber Heard (Mera), Patrick Wilson (Orm), Willem Dafoe (Vulko), Yahya Abdul-Mateen (Black Manta), Nicole Kidman (Atlanna), and Dolph Lundgren (Nereus). Some speculated Julie Andrews would also return as Karathen.
The plot of Aquaman 2 will likely focus on the early days of the reign of the new King Aquaman, possibly deals with the first threat he encountered as Lord of Atlantis. Speaking of threats, there are some villains left from the first movie - such as Orm/Ocean Master. He is the villainous half-brother of Aquaman, who might have been stopped but the latter crucially spares his life. So, there's a chance he might be coming back to the sequel to haunt them. Black Manta will also be back as he's the greatest foe of Aquaman.