From Entertainment Weekly's Summer Movie Guide on “Man of Steel”:

Enter Henry Cavill, the 29-year-old dark-haired, blue-eyed Brit selected to don the red cape this time. In this iteration, Clark Kent's heroic tendencies would rise to the surface only when the threat was great enough. It would have to be a global menace — one that might also trigger an internal conflict about whether he belongs on Earth even as he yearns to be among his own kind. That's what pits him against General Zod (Boardwalk Empire's Michael Shannon), a Kryptonian tyrant who wants Clark to join him back on Krypton, which would mean abandoning his post as defender of the weaklings of Earth.

Please compare with my April 16th post suggesting same.

Thanks to reader Tony for alterting me to this development.