There's an awful lot we don't know about Aquaman and there's a very good chance we won't learn more for quite some time, especially as so much work will need to be done on special effects and the like. Now, another major casting addition has been made in the form of Graham McTavish, an actor best known for starring in the likes of The Hobbit and Preacher (as the villainous Saint of Killers).
As you can see below, there's no word on who he will be playing and the identity of the character "has to be secret" for the time being. Could this be because we'll first meet him in Justice League? Geoff Johns recently made it clear that Warner Bros. is dialling back on a shared universe so chances are that won't be the case but you never know (his voice would be very well suited to someone like Darkseid).
The actor is clearly excited regardless and it sounds like there are big plans in place for his Aquaman role. Do you have any theories about who he might be playing? A villain seems likely but is far from guaranteed and there really are any number of characters he could be in the running for in the movie.