Board Thread:General Discussion/@comment-238662-20140606155753/@comment-5951092-20140611155228

Tragould wrote: I heard that The Secret Invasion will be hinted, and Electro was exposed to be a Skrull, and Thomas Gibson is rumored to be Mysterio, Gustuv Fiers will be the Chameleon instead of Gentlemen, Crispin Glover is said to be the real Electro since Jamie Foxx's version was a Skrull, Tim Curry as Dr. Octopus, Christopher Lloyd as The Vulture, Paul Giammatti's Rhino is said he is gonna be bulked after a radiation accident in the third Amazing Spider-Man, and the last one is gonna be Scorpion. Where did you hear all these rumors, a fan fiction?

According to the producers of Sinister Six, the Shazam easter egg isn't the official line up. So my guess would be: Green Goblin, Doc Ock, Mysterio, Kraven, Chameleon, and Vulture.