Director Scott Derrickson has been doing the promotional rounds for the film. He had some tasty quotes regarding sequels when speaking to Den Of Geek.
"I love the character", he said. "I love the visual possibilities and I know the comics so well. [The first movie is] the tip of an iceberg."
Doctor Strange Sequel
He went on to wax lyrical about Christopher Nolan's The Dark Knight when describing the direction he would take any potential sequel.
"What made The Dark Knight so great was that the origin story of Batman had been well-told, and then it was time to bring in a villain where you really got to go deep. And not just The Joker, also Two-Face. It was a more visceral experience. I'd love to do that for Doctor Strange."
He's certainly not wrong. Nolan delivered one of the best sequels of all time with The Dark Knight. It did build and expand upon Batman Begins brilliantly. It was darker, more involved and significantly more intense than the first film and was a massive hit. It's a good sign that Derrickson is thinking along these lines. The evidence is also there that Marvel Studios just might give him the creative control to take the sequel in a different direction.
After all, Captain America: The Winter Soldier was a marked tonal shift from The First Avenger and took great creative risks with the franchise. It also paid off handsomely.
It would be a big shock if Doctor Strange wasn't a box-office behemoth, so we'd imagine a sequel will be all-but-guaranteed. Marvel Studios haven't made a true flop yet, and we'd bank on Doctor Strange not being the first one. The character is due to return in future MCU movies anyway, including Avengers: Infinity War. But a solo sequel also has to be a priority. And if Derrickson and star Benedict Cumberbatch are keen to get back to work, we'd say it'll happen sooner rather than later.