From what I've read it seems like the plan is to do a Venom movie and a Sinister 6 movie and then Spiderman. Kind of an interesting way to go, could be cool to see the villain story arcs develop without having to cut back to the hero all the time.
There is also apparently a teaser for Carnage in the ASM2 video game I think Webb has been quoted as wanting to see Carnage on film. I think you could do a whole symbiote arc with Venom Carnage, then a movie of them bringing together the S6. And then the big battle!
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