Marvel had no comment.
Benedict Wong and Chiwetel Ejiofor also are expected to reprise their roles from the original film as, respectively, fellow sorcerer Wong and Strange’s compatriot-turned-nemesis Karl Mordo. And Elizabeth Olsen has been tapped to reprise her role as Scarlet Witch, aka Wanda Maximoff. Xochitl Gomez is also joining the cast.
Plot details are unknown at this time as is how big of role McAdams will have. Production will begin after Cumberbatch finishes filming on the next Spider-Man pic, where Cumberbatch also will be playing Doctor Strange.