Wandavision arrived in 2021 and set the stage for several more series on Disney plus! Scarlet Witch in the Agatha Harkness series could just be one of the new series to expand the shared universe! Elisabeth Olsen commented on this recently and increased the comments about it, and it turned some fans off.
In an interview with Good Morning America, Marvel's Scarlet Witch said that "there are no plans" for the future. At least about Scarlet Witch it looks like Marvel is trying to keep everything as open as possible!
“There's no plan, and I'm serious. I'm not a good liar, I wish I had a plan. And I'm not sure. I'm really excited for fans to see this movie because it's something very different than what they've seen, and I'm really curious to know what they want next, because I think it's a very surprising movie.”
About Doctor Strange in the Multiverse of Madness she said:
“I find the ending very shocking. Fans are usually the smartest for stories when it comes to these deep comic book stories that I'm not so familiar with, so I'm curious to know what they'd like.”
There aren't many details on how the series will unfold. But many would undoubtedly like to see the two together again in the series.