Fans expected a third installment of Avengers film maybe a couple of years from now, but Marvel surprises their fans, they will be having two of the Avengers 3. The third Avengers film is broken into two parts; the release date of part 1 is on May 4th 2018, and the second part will be on May 3rd 2019. It will be called Avengers: Infinity War.
Perhaps the split is a business move. After Harry Potter movie, young adult franchises have made a practice of splitting up their final movies to drag fans back every year. This maybe also the case for Marvel, bringing its most favorite characters back one last time, well provided that most actor's contracts could be up to these last two films.
Infinity War is also possibly to be a huge plot. This should conclude the Avengers' war versus Thanos, it a continuing story that has been threaded in the entire Marvel's Cinematic Universe. Provided that Marvel's entire cinematic universe is, a large giant plot, it makes enough logic that it would want to take enough time to state the capstone entry.
Marvel should have all of its movies plotted out until 2028, and it's also possible that Infinity War will have a major role in establishing what's to follow. That is going to be true of the forthcoming second Avengers film too, with President Kevin Feige, Marvel Studios president told to Buzzfeed about this currently with a enlightening, but possibly filled with spoiler statement, that the roster of Avengers would not be similar with the conclusion of the Age of Ultron. Marvel disclosed the films and release dates of all of its films until these final Avengers. Meanwhile, the second film of the Avengers, Age of Ultron, will be shown on May 1, 2015. The first Avengers earned $1.52 billion globally after its debut on May 2012.