4. Don't Expect To See The Wasp
Joss Whedon wanted to use The Wasp in The Avengers, but he was unable to do so because Marvel kept back both her and Hank Pym (two founding members of the team) for Edgar Wright's long delayed Ant-Man movie. With Janet Van Dyne supposedly dead in the Marvel Cinematic Universe, the likeliest candidate to take over the mantle is her daughter, Hope (providing that she doesn't end up being revealed as a villain). Before you get your hopes up though, it's been reported that Hope takes part in no superhero duties in Ant-Man, meaning that her transformation into The Wasp is probably being saved for a sequel. However, it's worth bearing in mind that this story was based on information from the original draft of the script, so there's every chance that this is one of the alterations which upset Wright.