[Spoilers??????????????]Working title may be Superman: Last Son of Krypton
Brainiac will be the main villain.
Kara Zor-El/Supergirl & Martian Manhunter may appear in the movie
The opening scene will see Brainiac attacking the city of Kandor on Krypton 10 years before Superman is born. Zod is leading the fight to defend Kandor but Brainiac succeeds and traps Kandor in a bottle. Brainiac will also have the civilization of Thanagar (aka the home planet of Hawkgirl and Hawkman).
Martian Manhunter bring Brainiac to Earth after chasing him for some time.
Other Justice League members will show up to help Superman defeat Brainiac.
WB wants J.J. Abrams to direct the movie
There is also rumored to be a Man Of Steel 3 for a trilogy