The big delay in filming for Batman vs. Superman may be due to the new film's Lex Luthor: Jesse Eisenberg.

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Production on Batman vs. Superman, a.k.a. Man of Steel 2 was slated to begin in early 2014, though it has yet to happen. Warner Bros. announced a release date delay to 2016 from its original premiere date in 2015. The delay was decided so that the filmmakers could "realize fully their vision, given the complex visual nature of the story."

However, new rumors have been swirling that suggest Eisenberg's casting may be the reason for the delay in filming. Eisenberg is filming a new movie called The End of the Tour, a biopic about the life of author David Foster Wallace. The movie is allegedly filming currently, which could explain the delay in filming for Batman vs. Superman.

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While these are still unconfirmed rumors, Eisenberg's Lex Luthor is presumed to be a big part of Batman vs. Superman, suggesting that they may not be ready to film without him present.

In other Batman vs. Superman news, Gal Gadot recently posted a new photo of the results of her workout routine. Gadot is set to take on the iconic role of Wonder Woman in the film.

Gadot posted the new photo on Facebook with the caption "Selfi while standing on a ball. Now tell me this is not original! Good morning!!!" She previously posted a photo of one of her growing biceps.

Batman vs. Superman is scheduled for release in theaters on May 6, 2016.