Below the jump (in case this turns out to be some kind of spoiler) are three frames of footage taken from approximately the 2:06 - 2:07 mark of the new "Man of Steel" trailer that seem to show Superman in combat with... something...
So! Big swirly vortex, what look very much like tentacles or tendrils of some kind, possibly a glowing "eye" or orb of some kind at the center? Could be mechanical in nature, could be a creature, could be something else entirely?
The "arms" immediately make me think of Starro The Conqueror... but I can't believe Nolan and company would go for that. Brainiac? Some new, weird version of the Phantom Zone?