"Iron Man 4" has long been waited by fans after Robert Downey Jr. successfully played the role of a genius, billionaire philanthropist Tony Stark in the first three instalments.

Rumors are rife that the movie is scheduled for 2019 and that a new female character named Riri Williams is said to replace Downey as it is time for a younger person to take over.

However, in a latest interview with Marvel President Kevin Feige, he revealed that "Robert Downey is the "Iron Man," and he can't "envision anyone else" for now.

Though "Iron Man 4" is still a mystery, fans have been very vocal on social media about their wishlist or what they want from the movie to happen.

First, they want Jon Favreau to comeback. He is an actor and a filmmaker responsible for kicking off "Iron Man" franchise and also bringing in Robert Downey Jr.

This might be possible as Favreau, previously tweeted an image with Downey, Russos and Feige having dinner together. It seems like they were having a lot of things to discuss.

Second, fans wished to see Bruce Banner as a side character in "Iron Man 4" since Tony Stark and Banner have already proven that they have a chemistry that shouldn't be taken away so easily.

Third, they have been clamouring for Ant-Man to appear in the most anticipated movie and unite him with Stark since they have a shared enemy- The Ten Rings. It is said that both have olden times with the terrorist group and most especially they have reason to fear them.

Fourth, some fans want to witness the death of Downey Jr. in the "Iron Man 4"if he will not be playing as Tony Stark anymore. They said it is a better way to say goodbye to his character. But others suggest an alternative to killing Stark and it is introducing The Illuminati - the board of super-intellects who created a kind of super-watch together with Stark and Doctor Strange (as well as Mr Fantastic, Black Bolt and Namor). It is said that using them to deal with the Hulk situation is a good plot to focus on "Iron Man 4."

Lastly, fans want to see the one and only Robert Downey Jr. in the much awaited movie. However, with the current contract situation of the actor, it is not yet known if he is going to reprise his role. If Downey is killed in the Infinity War movies, then "Iron Man 4" might not be possible to happen.

Marvel is yet to announce the release of "Iron Man 4."