It's been speculated that Zack Snyder may have snuck a Christopher Reeve Easter Egg into the Man of Steel World Engine scene.
When Henry Cavill flies up into the energy/light, there is a frame of what appears to resemble Christopher Reeve's face.
While promoting Batman Vs. Superman, Zack Snyder is asked about the potential Christopher Reeve Easter Egg, in which Snyder says that's not the case.
"Fan theory," Snyder told Cines Argentinos (via reddit) while smiling and shaking his head back and forth in the no. "It's just the way it looks. It's not... I mean if it looks like that, that's the gods. Not me."