According to Variety, Sony is in early talks with Jamie Foxx to play the villain in The Amazing Spider-Man 2. In the comic books, Electro is a supervillain with the power to control elecricity. He's one of Spider-Man's earliest villains, having first appeared all the way back in The Amazing Spider-Man #9.
Back in July, Comicbook.com speculated that the Amazing Spider-Man after the credits scene could be hinting at Electro as the villain, because the mysterious figure appeared and disappeared with the crackle of lightning. The Amazing Spider-Man 2 is set to arrive in theaters on May 2, 2014.