It's been teased for quite awhile that Tobey Maguire and Andrew Garfield were in talks to return as their iterations of Spider-Man and appear in Tom Holland's Spider-Man 3, which apparently is suppose to be a live-action version of 2018's Spider-Man: Into the Spider-Verse. Now, it's been confirmed that not only are Maguire and Garfield in talks...but Kirsten Dunst and Emma Stone are also in talks to join as Mary Jane Watson and Gwen Stacy.
Everyone is still officially in negotiations, but they are all following confirmed reports earlier today that Alfred Molina will return as Otto Octavius/Doc Ock, a role he was critically acclaimed for playing back in Maguire's 2004 film Spider-Man 2. For some time, Sony has tried to keep it under wraps of the intention to do a live-action Spider-Verse storyline though additional casting has further and further proven this is exactly what they are planning.
Beforehand, Jamie Foxx was confirmed to be returning as Electro, a role he played in Garfield's 2014 film The Amazing Spider-Man 2. But the big hint was Benedict Cumberbatch being announced last month to be appearing in the film as Doctor Strange. This film is expected to follow Cumberbatch's next solo effort as the character, Doctor Strange in the Multiverse of Madness which, in turn, is following the Disney+ series WandaVision. It's been widely implied that Phase 4 of the Marvel Cinematic Universe would be dealing with the Multiverse, particularly with another Disney+ series, Loki, dealing with an alternate timeline version of Tom Hiddleston's character. Essentially, this is just Sony making official which had been confirmed for some time.
Jon Watts, who directed Holland's two previous solo Spider-Man films, is returning as director with the film currently set to hit theaters December 21st, 2021.