Doctor Strange might become a part of Marvel's Cinematic Universe sometime after The Avengers: Age of Ultron.
In case you haven't noticed, superhero movies are the cinematic blockbusters of this decade, which means big name stars want to get in on the action. Within Marvel Studios alone, Benicio Del Toro had a recent cameo in Thor: The Dark World, while Michael Douglas will be playing as Hank Pym in Ant-Man. Undaunted, Marvel Studios is already planning for Phase 3 of the Marvel Cinematic Universe, where resident magician Doctor Strange might receive his own feature film. We know this because Johnny Depp himself is being considered for the role of Sorcerer Supreme, having entered into talks with Marvel for a possible 2016 release.
Doctor Strange first appeared in 1963 as Dr. Stephen Vincent Strange, a brilliant but egotistical neurosurgeon who shattered his hands in a car accident. With his career at risk, Strange travels the globe seeking a miracle cure, only to renounce medicine upon discovering an aptitude for the magical arts. If this Doctor Strange adaption closely follows the comics, it would be the first explicit presence of the supernatural in Marvel's Cinematic Universe (since the Thor movies are technically science-fiction).
Outside of looking the part, Marvel has other reasons to consider Depp for Doctor Strange. The actor has a good relationship with Marvel's parent company Disney, is known for playing eccentric characters, and as a comic fan, he's apparently itching to try his hand at a Marvel superhero. On the other hand, Depp is already signed on for Pirates of the Caribbean and Alice in Wonderland sequels, and may not be able to commit to Marvel's schedule. It's still too early to say, so until Marvel makes an official announcement, we'll just have to wait and see.