Concerning the entire Hulk-in-Avengers thing, Edward Norton has now posted the following statement on Facebook.
Click to see it in full.

Now following recent reports that Edward Norton will not be playing Bruce Banner/The Hulk in the upcoming team movie The Avengers, Norton’s agent has responded to Hitfix.com with an exclusive statement.
You can read the agent’s statement at their site.
MTV’s Splash Page recently spoke to actor Edward Norton and asked about the possibility of him returning as the Hulk’s alter-ego Bruce Banner for the in-development Avengers movie.
“Well, if people want it all to come together, they’ve got to email Marvel and say, ‘This is what I want,’” Norton hesitantly responded to the site.
There you have it. Sounds like a negotiation tactic, but one we wholeheartedly approve of. Norton brought a great feeling to a live-action Banner that was only matched by the late Bill Bixby.
MovieWeb caught up with Marvel Studios’ Kevin Feige last week and asked about The Hulk’s future in the Marvel movie universe.
“Not before The Avengers,” he told the site. “He was there in The Avengers #1 and in The Ultimates #1 so certainly the Hulk is a key part of these films leading up to The Avengers. Iron Man 2 has some clues to where these timelines take place as they relate to each other. So I certainly think Hulk will be a player on that team.”
As for whether or not Edward Norton would be returning to reprise his role from The Incredible Hulk, Fiege says a lot of it depends on the story, among other things. “A lot of it depends on the story, a lot of it depends on the schedule and a lot of it depends on the lofty ideas that we have,” he says. “You also have to work with the realties of people’s schedules as to when they are available and stuff like that. So we reserve the right to say Hulk will be in it for sure, we’ll see about Banner.”
Read the entire interview at MovieWeb.