Re: Changing the roster for Avengers 2?
Returning: Captain America, Hulk, Iron Man, Thor
Leaving: Black Widow, Hawkeye
They're going to stick with characters that are known for the movies and throw a lot of cannon out the window because it just gets too out there. They'll stick with the formula that proved successful with The Avengers.
I'd also love to see a movie focusing on Black Widow and Hawkeye in the style of a thriller. It has a lot of potential and would be cool to see. Even if they don't appear in Avengers 2, we need to see them again sometime.
Put the black costume in Amazing Spider-Man 3, use the crashed space shuttle for its origin. Introduce Jensen Ackles as Brock, the climax will have Spider-Man lose the symbiote in the tower, then post-credits we see Brock as Venom.