While we won't see Edward Norton side by side Jeremy Renner in The Avengers this Summer, you can see the one time Hulk actor playing in the Bourne Legacy.
Edward Norton plays the villain in the movie, Byer, and MTV got a first look as part of their Summer preview (see below).
And director Tony Gilfroy offered the following when asked about the previous three movies:
Everything that happened before was not a dream. Everything that happened was completely real, but you thought you knew what was going on. You thought you were seeing the world, and this movie is telling you that there's a much larger world, a much larger conspiracy beyond this. The events of the other three films are incredibly present, but they're not really in this very much. What happens in "Ultimatum" is really the spark that's blowing open the door to this movie because the Jason Bourne story is exploding out into the public. Being impossible to conceal any further is causing problems for this much larger conspiracy. "Ultimatum" plays in the background of the very beginning of this film.
Regarding Edward Norton and the Hulk, Mark Ruffalo actually called Edward Norton to ask for permission to play the behemoth, as this was a sore subject because Norton was not brought back for The Avengers. It's thought in some circles that due to Edward Norton being too big of a name, that Marvel Studios didn't want him to outshine Robert Downey Jr. in The Avengers movie.
The Bourne Legacy opens August 3rd.
The narrative architect behind the Bourne film series, Tony Gilroy, takes the helm in the next chapter of the hugely popular espionage franchise that has earned almost $1 billion at the global box office: The Bourne Legacy. The writer/director expands the Bourne universe created by Robert Ludlum with an original story that introduces us to a new hero (Jeremy Renner) whose life-or-death stakes have been triggered by the events of the first three films.
For The Bourne Legacy, Renner joins fellow series newcomers Rachel Weisz, Edward Norton, Stacy Keach and Oscar Isaac, while franchise veterans Albert Finney, Joan Allen, David Strathairn and Scott Glenn reprise their roles.