rough that will blow everyone away. (Hell, they're hoping that happens with Chris Hemsworth in Thor.) And the Hulk, when it's all said and done, doesn't need to be a big actor's part. Hitfix assumes his ouster will ultimately due to money issues - because Avengers will be such a money-crunching project. I'm going with the theory they don't want a potential hassle with a head-strong artist.
Thing of it is, Norton was, and reportedly still is, willing to be a team player. He even apparently met with Whedon to discuss the script... For now, no one really knows.
The real question is, will the fanboy community really care if Norton doesn't come back? The Incredible Hulk was popular, and is actually a good movie, but it's not a classic, not beloved. Replacing Robert Downey Jr. as Tony Stark would be one thing... is this really on the same level?