The WandaVision finale premiered and with it most of the series questions were answered. In typical Marvel fashion however, the two post-credits scenes left us with a few more.

First, the mid-credits scene belongs to Monica Rambeau. To no one’s surprise, given her mother’s history, a Skrull appears to the newly powered hero. She mentions an old friend of her mother’s wanting to see her up in space, and with what we know from the post-credits scene of Spider-Man: Far From Home we can only guess that that old friend is Nick Fury.
Fury and Maria Rambeau go back to the Captain Marvel, days when Monica was a child, and there’s no doubt Fury is keeping an eye on everything from up above. He’s ready to get Photon on her way, and surely he’ll help her find her way to people who can help her learn about her powers.
It would be shocking to not see Monica in the Captain Marvel sequel set to release November 11, 2022.
For the first time of the series, there was a post-credits scene as well, this one featuring Wanda.

She’s holed up alone in the mountains, reading up on her powers from the Darkhold she stole from Agatha in an astral projection, but her physical form is wandering around a cabin. This cabin is likely in Transia, the home of Wundagore Mountain.
In the comics, Wundagore Mountain is monumental in the Maximoff history. The Maximoff’s backstory has changed throughout the decades, but it always links back to Wundagore Mountain. Most recently, Wanda discovered she actually isn’t the child of Magneto, but an orphan witch trained within the Mountain. It also the location the Darkhold was created — Wanda’s newly acquired text where she’ll be learning all about her powers and how to control them.
Transia and Wundagore Mountain are also where Billy and Tommy went searching for their mother after her disappearance out of shame from her antics in Avengers Disassembled and House of M (similar to those seen in WandaVision) in Avengers: The Children’s Crusade, so it’s only fitting that it is here that Wanda finds the disembodied spirits of her boys calling for her. (However, Wanda turns up in Latveria tangled with the villain Doctor Doom … will we see him soon?)
This scene seemingly wipes out the involvement of Mephisto in the twins creation, but Phase 4 and beyond is still searching for their big villain, so don’t count him out yet. Billy and Tommy may be being held by him now …
The boys’ callout leads for a few possibilities of Wanda’s involvement in Doctor Strange in the Multiverse of Madness — whether the search for her children will be aided or abetted by the Sorcerer Supreme, and what doors she opens trying to find them with her newly acquired knowledge.