ComicBookMovie. This time it's General Sam Lane the father of Lois Lane (Amy Adams) and the military created villain Metallo. General Sam Lane sees Superman as a threat to national security and discovers that kryptonite is a powerful resource using it power Metallo's robotic suit. It seems a little too similar to the plot points of The Incredible Hulk but it might be the best way to ground the character giving a limit to his powers.
Previously there had been concept artwork for the J.J. Abrams/Brett Ratner version of Superman before Bryan Singer came in. One piece of the art has what appears to be the Metallo suit firing off missiles possibly containing kryptonite.