There's been a lot of talk regarding actor Jason Momoa playing Aquaman, and the character's place in Batman v Superman: Dawn of Justice. I've never been a big fan of Aquaman, but it there's a way to work him into the story and have him be portrayed as a badass character I'll give him a chance. Director Zack Snyder recently jumped to the defense of Aquaman in an interview with CBS Detroit saying:
"You guys were disparaging, a little bit… I don't want to give anything away about the movie or anything like that, but Aquaman has some cool abilities. People are like, 'Oh what? Does he talk to animals? Because that seems like what he does. Or fish?' The cool thing with Aquaman is he's Triton, so you have to realize that could cut the flesh of Superman if they came 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. Anyway, not to say he's in my movie or anything like that, but he has the potential to be bad ass, that's all I’m saying."
You can listen to the full interview here, but it kind of sounds to me like Aquaman will definitely be in the movie.