Marvel Studios president Kevin Feige said you’ll need a Disney+ subscription “if you want to understand everything” in future MCU movies. That does not mean that you’ll need to watch Disney+ streaming shows to understand the basic plots of these future Marvel Comics movies, but you will need to watch Disney+ shows if you want to know the ins and outs of “everything.”
Per an interview article with Bloomberg Businessweek, Feige revealed the tidbit about needing a Disney+ subscription, “because events from the new shows will factor into forthcoming films.” The first of these films that’ll require details only given in Disney+ shows will be Doctor Strange in the Multiverse of Madness. That’ll require that Disney+ viewers learn info via their Scarlett Witch streaming show and their Loki series.
Upon confirming that info from the shows will “tie in” with the next Doctor Strange film, Fiege said, “I’m not sure we’ve actually acknowledged that before, but it does.”
The show WandaVision will focus on the characters Scarlet Witch and The Vision. The TV show Loki will focus on Loki, and the show Hawkeye will focus on… you get the idea. You will not be able to watch these shows on launch day for Disney+. Disney+ Originals will be sparse at launch.
The series “Marvel Hero Project” will launch on Launch Day, but it’ll be at 9AM on November 12, rather than 6AM (when the service launches officially). That’s according to the official Disney+ streaming site, which says that Disney+ will start service at 6AM EST, Tuesday, November 12, 2019.
NOTE: This is likely a situation like Star Wars had comics as required reading if you wanted to know EVERYTHING. That link shows how there was a one-off comic that existed solely to explain why C-3PO had a single bright red arm in Star Wars: The Force Awakens. Gotta get that info!