Phase 3
Captain America: Civil War (May 2016)
Doctor Strange (November 2016)
Guardians 2 (May 2017)
Spider-Man (July 2017)
Thor: Ragnarok (November 2017)
Infinity War: Part 1 (May 2018)
Black Panther (July 2018)
Captain Marvel (November 2018)
Infinity War: Part 2 (May 2019)
Inhumans (July 2019)
Spider-Man 2 (November 2019)
My guesses as to the plot/villains of these films:
Captain America: Civil War will have Zemo as the villain behind the scenes. Doctor Strange will have Mordo and Dormammu as antagonists. Guardians 2 is that it'll bring Adam Warlock and Phylla-Vell onto the team and the villain will be the Matriarch. The Spider-Man reboot will hopefully feature Shocker and Scorpion as the villains. Thor: Ragnarok will have Surtur as the big bad and Enchantress as a secondary antagonist. Infinity War: Part 1 is going to involve Thanos killing half the universe and it's up to a new team of Avengers to stop him. Black Panther will involve Klaw as the bad guy which is all but confirmed. Captain Marvel will be an alien abduction movie that would involve Mahr-Vell dying and Carol taking his place with Yon-Rogg and Doctor Minerva as the villains and Shatterax as the heavy. Infinity War: Part 2 is going to be an Avengers/Guardians/Defenders team-up against Magus. Inhumans will deal with Maximus leading the slaves against the Inhuman Royal Family with tons of grey morality being thrown around. The 2019 Spider-Man Sequel will hopefully be Death of Jean DeWolff that involves the black costume, Ed Brock losing his job and a certain cop killer named Sin Eater that will have the post credits scene that leaves EVERYONE talking.
This is my hope for Phase 4 which would be a breather episode where it's all about really great solo adventures to adapt classic stories while setting the stage for Phases 5 and 6.
Iron Man: Armor Wars (May 2020)
Tony Stark is forced to confront the son of Obediah Stane as a new Iron Monger along with his henchmen Spymaster and Ghost who leak the Iron man blueprints to the world as Zeke Stane's long-gestating revenge. It's up to Iron Man to confront his worst nightmares as he goes rogue and is forced to stop the rogue Iron Men being developed by the Controller's creepy cult, Cordco (Firepower), Hammer Industries (Sasha Hammer) and the government of the Russian Federation (Crimson Dynamo) before getting his vengeance on Zeke Stane. The catch is that Tony missed AIM, Oscorp and Prometheus Corporation all developing Iron Man armors after the credits.
Hulk: Rise of the Leader (July 2020)
Ever since the fall of SHIELD in CA:TWS, Leader has been taken off the grid by AIM who have provided him with all the resources he needs for his bizarre experiments. Well, all resources save one. He needs the Hulk for a, "psychological experiment" in order to better understand Dissociative Identity Disorder. The Leader will force Bruce Banner to confront the abuse at the hands of his father while tapping into a new type of rage, one against the world for hounding him like a monster simply for existing. A new, evil grey Hulk emerges who may be more than the Leader ever bargained for. Introducing Marlo Chandler, Jennifer Walters and Rick Jones to the cast. (Hint, Jen gets injured and Bruce's blood transfusion transforms her.)
Fallen Son: The Death of Captain America (November 2020)
After Captain America is murdered by Crossbones, it's up to Winter Soldier and Falcon to unravel the mystery behind Cap's death. Crossbones was apparently not working for Hydra which digs the rabbit hole even deeper. What does Cap's assassination have to do with an extremist anti-immigrant political party in Austria called National Force and how is any of this related to the United States' failed plan to create a new Captain America during the Korean War?
Black Widow (March 2021)
Tasha Romanova finally in her own film as she seeks to atone for the, "red in her ledger" over in St. Petersberg. The catch is that the FSB aren't taking kindly to Tasha's defection and have dispatched Yelena Belova to hunt down Tasha as she seeks to make amends for her past.
Captain Marvel: War of the Marvels (May 2021)
Carol Danvers has been through a lot over the last few years. Alien abduction and that whole issue with the Magus have driven Carol to alcoholism and now her therapist may actually be a psychopath who's trying to kill her and usurp her identity. What a horrible, terrible week.
Guardians of the Galaxy: Conquest (July 2021)
You thought Ultron destroyed? Guess again. He's back along with his entire Iron Legion to destroy both the Kree and Skrull empires in order to bring the age of organic life to an end once and for all. Nova and Moondragon join the team.
Black Panther: Gorilla Warfare (November 2021)
T'Challa is forced to deal with a domestic terrorist threat as the J'Bari tribe attempts to overthrow the government of Wakanda. T'Challa must confront Wakanda's deep inequality if he wants to ensure that there is never another M'Baku to threaten him.
Ghost Rider (March 2022)
Johnny Blaze was never known for making good life decisions. Saving the life of his boss with the use of forbidden magicks at the cost of being possessed by the fallen angel Zarathos may very well be one of the dumbest decisions he's ever made. His first task is to reap the soul of a serial killer calling himself the Scarecrow. (This film needs to be a hard R gorefest. It's the only Marvel property that can't be done on a TV budget that requires an R-rating. Please Marvel, don't mess this up.)
Spider-Man: Venom (May 2022)
Ed Brock, now bonded with the symbiote is out for revenge against Spider-Man. Spider-Man's most dangerous and personal enemy debuts and he has no agenda on his mind other than defeating Peter Parker.
Doctor Strange: The Cult of Shuma Gorath (July 2022)
Paranormal investigator and sorcerer supreme Stephen Strange is hired to investigate a series of occult ritual murders done in the name of some obscure forgotten deity named Shuma Gorath. With assassin's hunting him at every turn and the fate of the entire universe hanging in the balance, the stakes have never been higher. Featuring a Lovecraftian tentacle god with a giant eye in the third act!
Thor: The Dark Gods (November 2022)
Perrikus and his dark gods were imprisoned for years by the Asgardians. Undoing the cycle of Ragnarok broke the seal upon them so they may return to bring the realms under their rule once more.
Mighty Avengers: Atlantis Attacks (May 2023)
An old friend of Captain America's from the war is tired of the effect that overfishing and pollution have had on Atlantis. Can Bucky Barnes really bring himself to stop Namor after all they've been through?
Inhumans 2
The black galaxy is on a collision with ours. What would you do if you found out that all life in both was about to be destroyed within days and you were tasked with averting it. Can you trust the man who once tried to dethrone your dynasty? This will forever go down as the movie with a talking planet with a face.
West Coast Avengers: Kang Dynasty
This is the day when evil wins. Kang has conquered the world and placed it all under his rule. Even when defeated, Kang's backup plan is to leave the world in the hands of a revived Norman Osborn who is now the director of SHIELD. Phase 5 is going to be four years of Dark Reign.
Phase 4 TV shows should be Runaways on ABC Family and Netflix series for Moon Knight, Punisher, She-Hulk and Elektra.