The trailer’s of Avengers:Age of Ultron have been criticized for not reveling enough by some fans. And there is no large amount of current rumors of what we HAVEN’T yet seen which include:
Captain Marvel has been cast and may cameo.
The Avengers roster will drastically change after the film.
Details about The Vision.
Avengers 2 connection to Black Panther.
Possible Avengers 2 Spider-Man cameo.
So check out the newest (international) trailer…
The Avengers: Age of Ultron releases in theaters on May 1 2015, followed by Ant-Man on July 17 2015, Captain America: Civil War on May 6 2016, Doctor Strange on November 4 2016, Guardians of the Galaxy 2 on May 5 2017, Spider-Man on July 28, 2017, Thor: Ragnarok on November 3 2017, Avengers: Infinity War – Part 1 on May 4 2018, Black Panther on July 6 2018, Captain Marvel on November 2 2018, Avengers: Infinity War – Part 2 on May 3 2019 and Inhumans on July 12, 2019.
source – Marvel