According to Metro on Jan. 12, "Game of Thrones'" Jason Momoa dismissed his role in Zack Snyder's "Batman vs. Superman". He mentioned that he thought it would be "awesome" to be in the movie and people ran with the rumor of him actually being in the film. Momoa denied all knowledge for the speculation that had been running around about his future in the Snyder film.
"It’s just a rumor. Maybe I told someone that it would be awesome and that’s how it started".
A month ago The Hollywood Reporter had stated that Momoa had been in negotiations to star in the movie and additional rumors of him being cast as the villain Doomsday quickly spread. For those who aren't aware of this tenacious villain, he was well known to have actually killed Superman.
On top of that, there also had been speculative thoughts on him playing Martian Manhunter.
Also, there is a scene of "Batman vs. Superman" being filmed in Camp Metamora which is owned by the Girl Scouts and has been vacated. Security is apparently tight out in those neck of the woods and as soon as they are done filming, it'll be as if they haven't even been on location at the venue.
"Batman vs. Superman" is scheduled to be released on July 17, 2015.