"Doctor Strange" isn't yet officially on Marvel Studios' schedule, but The Hollywood Reporter says four directors are currently being considered by Marvel: Mark Andrews, Nikolaj Arcel, Dean Israelite and Jonathan Levine.
Levine is likely the best known of these candidates, having directed the 2011 dramedy "50/50" and 2013 zombie comedy "Warm Bodies." Andrews co-wrote and co-directed Pixar's 2012 hit "Brave" and has worked on multiple other Pixar projects, and was a storyboard artist on "The Iron Giant" and 2002's "Spider-Man" film. Arcel wrote and directed 2012's "A Royal Affair," nominated for Best Foreign Language Film at the Academy Awards; Israelite directed the sci-fi film "Welcome to Yesterday," out later this year.
Marvel is also reportedly considering the duo of Jonathan Aibel and Glenn Berger -- whose credits include "Kung Fu Panda," "Monsters vs. Aliens" and "Alvin and the Chipmunks: The Squeakquel" -- to write the script.
Marvel Studios has claimed three dates for as-yet undisclosed films -- May 6, 2016, July 8, 2016 and May 5, 2017 -- one of which may end up being "Doctor Strange." In January 2013, Marvel Studios president Kevin Feige said Doctor Strange would "definitely" be a part of "Phase Three" of Marvel's films.