When Disney bought Marvel, it's a safe bet not too many people thought their first official team-up would be Dr. Strange, one of the more surreal superheroes in Marvel's lineup. That's especially true given that a Strange movie has been kicking around between different movies studios since 1986. But Deadline says there's now definite movement on the film:
Marvel Studios has hired Conan scribes Thomas Donnelly and Joshua Oppenheimer to write Dr. Strange, marking forward progress on a long-gestating superhero property which will likely be among the first Marvel films generated under the Disney banner. Aside from Conan--the Marcus Nispel-directed Lionsgate film that stars Jason Momoa--Donnelly and Oppenheimer also scripted a live action adaptation of the vidgame Uncharted: Drake's Fortune for Sony and producer Chuck Roven, and they wrote a draft of the Jon Favreau-directed Cowboys and Aliens for DreamWorks/Universal.
Deadline speculated that Dr. Strange might be the first collaboration between Marvel and the Mouse House based on this:
Marvel Studios has four more films committed to be distributed through Paramount (including Iron-Man 3). Those will include Thor and The First Avenger: Captain America, with the last to likely be The Avengers. Marvel is separately working on the youth-oriented Runaways as well as Ant-Man, which is also oft-mentioned as a promising character among the 5000 Disney acquired in its $4 billion buy of Marvel. Marvel is making the deal with the writers' reps at Gersh and Underground and they should get going on Dr. Strange shorly.