Professor X, Doctor Strange, Iron Man, Mr. Fantastic, and Black Bolt are some of the most recognizable characters on the page. With the seeds of the secret society being planted as early as this May, an appearance by the secret society on the streaming screen is very much on the table. The inclusion of Captain Marvel and Master Mordo indicates that the group isn't going to be a mirror adaptation, but that doesn't mean all of the group's founding fathers aren't still alive. An alternate version of Captain Marvel can be seen in the trailer, while the design of the Ultron bots hint at the presence of Superior Iron Man.
It's safe to assume that the Illuminati would be involved in a live-action adaptation of the World War Hulk comic. The Sacred Timeline is not written by the Time Variance Authority, but by the Illuminati, who operate as men behind the curtain. According to Chiwetel Ejiofor's Master Mordo, he is the one responsible for shackling Strange and bringing him before the Illuminati. The first break-up of the Illuminati was due to this decision.
The introduction of the secret society in Multiverse of Madness gives the Illuminati a launching point, and comic precedence indicates there are at least two major avenues they could go down.
Tony Stark formed the group after the war with thekrulls. Tony Stark would call it a collection of geniuses, billionaires, playboys, and philanthropists. The Skrull takeover led to the re-enactment of the Illuminati on the page.
It looks like Multiverse of Madness will have a unique line-up for its version of the Illuminati. While many have marveled at the mind-bending visuals and interactions between leading stars, the biggest talking point comes from an off-screen line of dialogue.
Patrick Stewart's Professor Charles X was revealed in Doctor Strange in the Multiverse of Madness.
Since Stewart confirmed he's spoken with Kevin Feige about reprising his role as Charles X, there's been speculation about Stewart's involvement in the Cinematic Universe.
The thrones are owned by the secret society of the smartest superheroes in the MCU. It was not known at the time if Stewart would continue where X-Men: Days of Future Past left off or if it would be another JK Simmons situation.
After deeming him too dangerous to remain on Earth, they excommunicated him to space, which led to the creation of the World War Hulk storyline.
Secret Invasion is quickly approaching, while the rumored World War Hulk movie is far away.
Doctor Strange 2's iteration of Charles X is a mystery, but his role within Multiverse of Madness is shrouded in less secrecy.
Professor X addresses Doctor Strange inside of a futuristic council room after he is guided through the hallways by Ultron bots. The details of the project are unknown, including whether it would be a movie or a streaming series.