We already got a brief look at Jason Momoa as Aquaman in Batman v. Superman: Dawn of Justice earlier this year. The fishy one will appear in next year's team-up movie, Justice League, and will be bringing in one of his friends.
You may have heard earlier this year that Amber Heard was cast as Mera, who is Aquaman's wife and (former?) queen of Atlantis in the comics. Well she was, and she will be making her big screen debut in Justice League.
Mera's first appearance was in Aquaman volume 1, number 11
Here is the final concept art for Mera for Justice League:
Mera final concept art by Michael Wilkinson
How Mera will look in Justice League:
Amber Heard as Mera, shot by Justice League director Zack Snyder (hence the lack of color)