AVENGERS: INFINITY WAR 2/2
Iron Man is expected to die in "Avengers 4" due to Robert Downey Jr.'s contract expiring and because it's the most logical resolution to his overarching storyline
Chris Evans has already renewed his contract for more movies, so Captain America won't die
Thor might die as negotiations with Chris Hemsworth are still ongoing
Hawkeye and Black Widow might also die, as negotiations are still ongoing. While it's likely that Scarlett Johansson will renew her contract, Jeremy Renner probably won't
The Hulk won't die and Mark Ruffalo is slated for further movies
In Phase 4, Spider-Man, Doctor Strange, Black Panther, Captain Marvel and Scarlet Witch are expected to take even more prominent roles
There's interest in She-Hulk, but it's complicated due to Marvel Studios' arrangement with Universal Pictures over Hulk movies
There's interest in introducing Hercules to the movies
There will be a new overarching storyline that'll inform Phase 4, but Feige and his associates are still figuring out whether they'll do something as wide-spanning as Thanos again, or keep these big story arcs confined to each phase
With Norman Osborn now back in their catalogue, there is interest in further exploring the political aspects of the MCU with a version of the Dark Reign storyline, including the introduction of Sentry
There's also interest in a version of the Secret Invasion storyline which would be carefully laid out over several movies. If they ever do something as big and ambitious as Thanos, it would be this
Inhumans are still in development, but the recent falling-out with Ike Permultter, the biggest pusher for the project, and the Inhumans also being tangled up with the TV department through Agents of SHIELD means it's very likely they'll officially scrap it.
There's renewed interest in Thunderbolts after Suicide Squad wasn't quite what "trailers made it out to be"