Originally Posted by Mr. Dent
I think Thor and Cap are going to be the characters to get the shaft.
-Tony creates Ultron
-Hawkeye is going to get a bigger role because of the first movie and not being in any other phase 2 movies
-Widow is going to get a bigger role because Whedon hard on for female characters
-Hulk is going to have a big role because of how popular he was in the first film and not having his own film in phase 2
-Scarlet Witch and Quicksilver are going to have bigger roles because new characters with interesting powers, and Whedon hard on for female characters
It's certainly possible but making some characters less important because they have their own movies would be pretty dumb imo. This is an Avengers movie, it should focus on those characters and the solo movies work as build up for that.
I trust Whedon to be a good enough writer to give everyone the time they need since you shouldn't introduce new members unless you can do that.