Well, it looks like all the fan-casts were right this. Time and time again, Benedict Cumberbatch was rumored to be the star of many movies, including in here Star Wars Episode VII and some upcoming DC solo features. However, the Star Trek Into Darkness star was cast in Doctor Strange, according to Deadline, IMDB, and several other sites.
Doctor Strange will be directed by Scott Derrickson (known for Sinister and Deliver Us From Evil), while the script is currently rewritten by Jon Spaihts (of Prometheus… fame?).