With director Scott Derrickson having been announced months ago (with sources saying that he's likely been tied to the project since as early as January), and Joaquin Phoenix rumored for the lead role as well as being reported to have purchased a handful of Doctor Strange comics in person recently, it only seems fitting that the next part of the process would be to begin planning out locations and the film schedule.
According to new reports, Marvel Studios will begin production in May 2015 for the July 16th, 2016 release date, which while the date is not confirmed, connecting the dots between what Studio President Kevin Feige has revealed has lead us to believe so. May 2015 will be a very busy month for Marvel Studios, as Avengers: Age of Ultron and Marvel's Daredevil will be getting their premieres, which one can only expect to have massive repercussions throughout the combined cinematic universe. Earlier this year, Feige stated:
So Strange is very, very important, not just because it’s an amazing character study, and a journey of a man who’s gone from this very arrogant surgeon to somebody who is quite zen and literally keeps all of reality together on a daily basis, but it also is going to open up a whole other side of storytelling for our movies. So we’re about to hire a writer to redo a draft, and we think we’ll be casting probably in the next month or two, and announcing an actor, and then we get into production in the spring of next year.
If this timeline goes in chronological order, then Doctor Strange has been officially cast and the writer has been hired. Joaquin Phoenix, all eyes are on you. The reports suggest that Doctor Strange will be at Pinewood Studios Shepperton, which has been the same production studio for Captain America: The First Avenger, Thor: The Dark World, [Guardians of the Galaxy](movie:424073), and [The Avengers: Age Of Ultron](movie:293035).
The date of May 2015 means that production will begin only a month after Captain America 3 begins at Pinewood Studios Atlanta, the same location that is currently producing Ant-Man, which will also be the first film to be produced at the brand new Pinewood location. Due to vast environmental diversity in the Atlanta area, as well as extremely lenient and minuscule taxes on film productions, Pinewood Studios Atlanta is sure to become a regular location for Marvel Studios.