Speculations about "Iron Man 4" continue to swirl online as fans can't get enough of Robert Downey Jr.'s character as Tony Stark. It seems like avid fans need to have more patience to wait much longer after the release of Marvel Cinematic Universe's Phase 3 timeline.

According to reports, "Iron man 4" might hit the big screen later than expected since it's not included in the list of Marvel Studio's lineup of movies. Marvel only confirmed the launching of "Ant Man and the Wasp," together with "Black Panther" on 2018 and the debut of "Captain Marvel" in 2019.

"Additionally, Ant-Man's second adventure will lead to a couple of other films shifting their dates, with Marvel's "Black Panther" moving up to February 16, 2018 and Marvel's "Captain Marvel" landing on March 8, 2019."

There were rumors; however, that the highly-anticipated movie will come out on 2020 since there were three untitled Marvel Studio films that are expected to premiere on 2020 including one on May 1, the other on July 10 and the last one on November 6.

On the other hand, latest reports suggested that the postponement of "Iron Man 4" progress is due to Robert Downey Jr.'s demands. The 51-year-old actor was reportedly asking for a $50 million increase in his salary for him to reprise his role in the said movie.

Rumor has it that the "The Judge" star is asking for a fraction of the film's sales because he is confident and optimistic enough that it will again be a blockbuster hit.

Other speculations suggested that the "Sherlock" star is leaving the franchise and might get killed or replaced in the most-awaited movie. Fans, however, might protest if the superhero will end in such way.

Moreover, according to Forbes, "Marvel is not so hot without Iron Man" since the movie is a box office hit.

"The MCU films that feature Robert Downey Jr.'s Iron Man make a lot more money than the ones without Tony Stark. Iron Man ($585 million) and Iron Man 2 ($623m) both made a lot more, in 2D no less, than The Incredible Hulk ($262m in 2D), Thor ($449m in 3D) and Captain America: The First Avenger ($371m in 3D) in the run up to The Avengers."

"Iron Man 4" still remains a mystery as Marvel Studio and Robert Downey Jr. are mum on the issues.