Zack Snyder wants you to take Aquaman seriously. The director caught wind of a couple radio DJs talking smack about the superhero, and he wasn't amused. Snyder called in and quickly jumped to Aquaman's defense. In the process, Snyder avoided any confirmation about Aquaman's appearance in Batman v Superman: Dawn of Justice.
Zack Snyder: I'm on my way to set right now, and I was listening to you guys on the radio. And...you guys were disparaging (a little bit) Aquaman, just a teensy...I mean it didn't feel like hatred.
DJ: Yeah, we were questioning why he was involved.
Zack Snyder: I don't want to give anything away about the movie, or anything like that. But, Aquaman has some cool abilities that I think people are like, "Oh what does he talk to animals, because that seems like what he does, or fish or whatever?" The cool thing is, with Aquaman his trident (people don't realize this) that could cut the flesh of Superman, if they come in contact. That's a thing that's in the canon. He's super strong. Because of course he can exist at these super deep depths. So when he comes up here he's crazy strong. Not to say he's in my movie, or anything like that. He has the potential to be badass. That's all I'm saying.
Jason Momoa's been rumored to play Aquaman in Batman v Superman, but it hasn't been officially confirmed. If you're going to beef up Aquaman's profile, casting Momoa would be the perfect way to start. It's fair to say Snyder has something to prove with his version of the character that may or may not appear in the film.
You can listen to Snyder's full interview here.