What follows is not confirmed reports, but might be spoilers for the upcoming movies in Marvel's Phase 3.
The newspaper Latino Review claims to have spoilers for many of the movies in Marvel's Phase 3, including Avengers: Age of Ultron and Thor Ragnarok.
Avengers: Age of Ultron
in this movie, there is supposed to be a whole new line of Avngers which are going to be led by Steve Rogers (Captain America). This does not come as much of a surprise as Kevin Feige said,"the roster will be altered by the finale of tthe film.
Thor : Ragnarok
In this movie, it is said that Thor will be left trapped in a galactic prison after he kills and revives many Asgardians. This is not likely as nothing like this has ever happened in the comic books.
Captain America : Civil War
In this movie, it is revealed that Bucky Barnes (Sebastian Stan) is Howard Stark's killer. This leads to Tony Stark (Robert Downey Jr.) and Steve Rogers to battle, though Tony is discouraged from doing so. Captain America is killed in this movie, and Bucky now takes the mantle of Captain America. Black Panther is also introduced in this movie.
Avengers: Infinity War Part 1
This movie will see the new lineup of Avengers, which supposedly include Spiderman, which is a Sony property, along with Quicksilver and Scarlet Witch. Lets hope that Sony agrees to loan Spiderman to Marvel, at least for Avengers : Infinity War.
That's all, folks!