Spider-Man 4 is just in the early stages, according to director Sam Raimi. But Australian cinema chain Hoyts posted a synopsis on its website, including the movie's villians. And it sounds... similar to Spider-Man 3.
Here's the Hoyts synopsis, which should obviously be taken with several massive grains of salt:
Peter Parker now faces a more greater threat. After a man is accidentally killed in an electrical power outage; a mass murderer has bonded with a symbiote. Thus wreaking havoc as Peter faces this red rampage, as well as an electrifying madman.
It sounds like the film could feature Carnage, the other symbiote-bonded maniac, plus Electro, the "electrifying madman." Of course, it seems kind of random that the movie's first synopsis would turn up on an Australian movie-theater-chain website, including such amazing grammar as "a more greater threat."
Of course, MTV already speculated that Carnage could be in the movie, based on an off-hand remark which Raimi made, plus very thin (and apparently untrue) rumors about Mickey Rourke being up for a role. [Mania]