The second movie of The Avengers (2012) titled Avengers: Age of Ultron indeed has not been released yet until May 1st, 2015 later. But the news related to the third series, The Avengers 3 has been already reported widely on media. The movie produced by Marvel Studios is reported will be split into two parts, just like the some outstanding movies such as Harry Potter, The Twilight Saga, The Hunger Games and also Divergent.
Based on the news from The Daily Marvelite, Marvel plans to make a gigantic battle among the heroes in the first of The Avengers 3 part one, and gives the result on the other part 1 year later. Besides, The Avengers 3 is also expected to pass with the last series from Guardians of the Galaxy which is also a big project of Marvel.