Bloomberg: Bob Iger Takes the Gloves Off for Disney's Streaming Debut. https://www.bloomberg.com/news/features/2019-11-07/inside-disney-bob-iger-on-star-wars-pixar-and-more
If you want to understand everything in future Marvel movies, he says, you'll probably need a Disney+ subscription, because events from the new shows will factor into forthcoming films such as Doctor Strange in the Multiverse of Madness. The Scarlet Witch will be a key character in that movie, and Feige points out that the Loki series will tie in, too. "I'm not sure we've actually acknowledged that before," he says. "But it does."