Anthony Mackie was doing an interview and he had the following comment:
“It’s more of an acting movie than an action movie. I feel like the story is very concise and interesting. And you get to see Robert Downey Jr, Chris Evens, Scarlett Johannsson and Mark Ruffalo, and everybody, just do really good acting.”
Sounds like the Hulk may be in the movie after all. Mark has denied it when the rumors first came out so it might be that his appearance is either a small cameo or is meant to be a surprise and may even lead into his appearance in the next THor movie.