During a panel at CCXP, Marvel Studios president Kevin Feige confirmed that Tom King's "Vision" comic book was used as an inspiration for the WandaVision series, and revealed at least one of the comic book characters we'll see on screen.
“Partly, yes. If you know this comic, you will find Spark the Dog at some point in the series. But it's just an inspiration, we take a different direction, based on where we are at MCU after ‘Ultimat '.”
WandaVision will be directed by Matt Shankman of "Game of Thrones" and debuts in 2021 at Disney +. Elizabeth Olsen and Paul Bettany return in the roles of Scarlet Witch and Vision.
All we know of the plot is that we will have a direct connection with "Doctor Strange in the Multiverse of Madness".