dammit..there weren't many scrawny villians that Spidey faced...Unless it's going to be Venom/Carnage
They did mention Double trouble
and if i remember right, Cassidy wasn't exactly a ripped host for the other symbiote. They mentioned in Spidey 2 that J.J.J;s son was back from space, so all we know the symbiote that becomes Venom (after finding Flash Thompson) could already be around. (i know they didnt' elude to it at the end of Spidey 2, and that they were eluding to Hobgoblin, but hey, this is the only thing i can rememeber that would make sense.
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I'll definetly be taking a seat at that movie