Maybe Phase 4 is and introduction to MCU X men, Why?? and How??
Why, because the X men and all Marvel Character in Fox Right is Comeback to Marvel.
As WandaVision thought, that Wanda Maximoff have a little power before Mind Stone experiment.
How, maybe like this:
1. Throwback in Avengers Age Of Ultron, when Marvel introduced Scarlet Witch and Quicksilver.
2. There are a rumour that Maximoff Family Will introduced in WandaVision (yeah, that's right and the Father of Maximoff twins is not Magneto).
3. X Gen maybe introduced in WandaVision and more on Eternals.(as we Saw on WandaVision that Wanda Maximoff have a little bit power, before Mind Stone Experiment).
4. In The Falcon And The Winter Soldier, maybe we can see Wolverine Easter egg, like Madripoor and Weapon +, Weapon + still projects who make a perfect soldier just like Wolverine.
5. Celestial created Mutant.
6. There Will be Russian Mutant in Black Widow movie, Ursa Manor maybe.
7. In Ten Rings competition maybe we'll see a mutant, i hope like Psylocke, and i want to see Iron Fist on Shang Chi and The Legends of Ten Rings.
8. Maybe we can introduced Iceman, Jean Grey, Cyclops, and Pyro on Spiderman: No Way Home, but this is Impossible.
9. Profesor X team up with Doctor Strange.
This is just from me
