So, it seems a few folks are a little bent out of shape that there was no big reveal of Mephisto in the WandaVision finale from Marvel. And the bottom of the market has fallen out for his first appearance, Silver Surfer #3 from 1968, now selling for hundreds rather than thousands.
But in the comic books, it is all about Mephisto right now. In the Avengers, he brought back Phil Coulson from the dead and used him to recruit the Squadron Supreme as the United States Of America rival to the Avengers.
So the upcoming Heroes Reborn event gives us a world where Captain America stayed frozen, Tony Stark never had his Iron Man moment, and Thor is an atheist – is a world in which Mephisto did not create the Avengers. But Phil Coulson is President of the United States and Squadron Supreme are the pre-eminent superhero team.
While in Amazing Spider-Man, Peter Parker, Mary Jane and Harry Osborn and revisiting the events of One More Day, with Doctor Strange, looking back at what Mephisto did to remove their marriage in return for the life of Aunt May. And where the Kindred version of Harry Osborn came from. And if Kindred is Harry Osborn, asking who the one walking around since Brand New Day is. And presumably that has to fit in with his overall plan.
Not to mention messing with The Champions, Doctor Strange and kicking off Damnation a few years ago.
Hey, maybe he'll show up in Falcon & The Winter Soldier?