With the Multiverse Saga nearing it's end with Avengers: Doomsday and Secret Wars, the next saga is already close. With Disney's acquisition of Fox and it's rights to Marvel characters like the X-Men, it is likely the next Saga will focus on the mutants. It could be named The Mutant Saga, but if the Phoenix Force comes into play The Phoenix Saga would be an apt title as well. However, the world of the MCU is also still occupied by the Avengers and other superheroes. So, here's a look at what the trilogies, titles and release dates could look like.
Spider-Man: The City That Never Sleeps
The next Spider-Man movie, Spider-Man: Brand New Day (2026), follows a street-level Spider-Man as he bonds with the piece of Venom and faces off against the likes of Mr. Negative, while also dealing The Punisher. All while trying to balance that life with his new college carreer. With MJ and Ned off to college, this is a good opportunity to introduce new friends: Harry Osborn and Carlie Cooper. Then, Spider-Man: Devil's Day (2028) follows Spider-Man fighting Kingpin (and Scorpion as his muscle) with the help of Daredevil and Black Cat, after she is betrayed by Kingpin.
The trilogy comes together in Spider-Man: One Last Day (2030). As Peter is teaches Miles his newfound powers, Octavius turns mad by his new science project. To fight the Spider-Men, Ock recruits Vulture, Scorpion, Mysterio, Shocker and Hobgoblin (Ned Leeds corrupted by Ock) into his Sinister Six. Outside of this, Spider-Man will most likely appearing in Avengers: Secret Wars. That movie could even see him unite with the other live-action Spider-Man to form the Spider-Corps, based on the Thor Corps of the comics. Eventually, Spider-Man could even join up with the Future Foundation.
X-Men: The Mutant Saga
The saga could kick off with Uncanny X-Men (2028). It follows the first team of the comics (Cyclops, Beast, Marvel Girl, Angel and Iceman) as they are revealed to the world by Mr. Sinister. Sinister plans to use Cyclops and Marvel Girl to prepare for a future threat, but is foiled by the X-Men. With mutants now out in the open, the X-Men are attacked and abducted by Sentinels in Giant-Size X-Men (2031). Only Cyclops remains, who recruits, Wolverine (introduced in his own tv show), Banshee, Storm, Sunfire, Colussus, Nightcrawler and Thunderbird to defeat the Sentinels and free the abducted mutants.
The threat Sinister has warned off has arrived finally arrived in Astonishing X-Men (2034): Apocalypse. Both the Blue and Gold teams work together with the time-travelling Cable to defeat him. However, they learn Jean wasn't Jean at all, but a clone replaced by Sinister and the real Jean is in space. A companion tv show could expand on the school's students like X-23, Shadowcat, Psylocke, Dazzler, Gambit, Jubilee, Bishop, Magik and Rogue and villains like Magneto's Brotherhood, The Hellfire Club and The Brood, while a Starjammers focuses on threats from space like the Shi'Ar.
Avengers: World's Mightiest Heroes
The next Saga could start with Avengers: Annihilation (2030), where Annihilus is coming for Earth. It's up to Nova, Captain Marvel, Thor, Hercules, Rocket's Guardians of the Galaxy, the Eternals and the Fantastic Four to form a united front against the coming attack. Annihilation could serve as conclusion to the arcs of Captain Marvel, Thor and Rocket. Following this is Avengers: Disassembled (2033), where Magneto teams up with his daughter Wanda. The Avengers eventually triumph over them, but not at the cost of the mutant population being severely reduced.
Finally, the Saga comes to a close with Avengers vs. X-Men Part 1 (2036) and Avengers vs. X-Men Part 2 (2037). When Jean, embued with the Phoenix Force returns to Earth, Cable and the X-Men fight the Avengers to protect her from them and the Shi'Ar. Part 1 ends with Jean dying and the Force being split in five parts. It merges with different X-Men, including Cyclops, and in the following year they reform the world. In Part 2, the Avengers and X-Men once again come to blows as the Phoenix Five's power grows unchecked. The conflict ends with Cable's daughter Hope absorbing the Force.
Meanwhile, on the tv side Thor and Captain Marvel fend off Norman Osborn and his Dark Avengers' attack on New Asgard in Dark Avengers, while Young Avengers, Midnight Sons and West Coast Avengers forms the Mephisto Saga. The teams are taking on Mephisto's son Blackheart, Dracula's daughter and Blackheart's mother Lilith, and finally Mephisto himself respectively. Phase 7 will also feature Doctor Strange in the Dimension of Darkness (2028), Black Panther 3 (2029), Nova (2029), and Shang-Chi and the Legend of the Immortal Weapons (2030).