Ladies and gentlemen, I have to come to you with a heavy heart. It appears that an Atlantis movie will never be made. Here is a link to an event where the audience asks Jason Momoa (Ronan Dex) questions and one of the questions is about an Atlantis movie.
You couple the problems Jason said with the fact that he has now been cast as the new Conan, you might as well kiss the Atlantis movie good bye. It's makes the cancellation of Firefly by FOX look like a genius move! Oh what could have been...