Doomsday, anyone?
*
puts up hand for a high-five, nobody responds, puts hand down and walks away sheepishly*
Seriously, it sounds like Zod will be in the movie, though I wonder if it will just be the Krypton parts or if he'll appear later also. Another one to consider that hasn't been done in any of the earlier live action films is Brainiac. He's a formidable foe.