Benedict Cumberbatch is believed to be the front runner to play Doctor Strange. However, Marvel said nothing about Doctor Strange casting in their big event last week. Mr. Feige was even asked about Cumberbatch directly and only said that if it was official it would have been announced. It sounds like Cumberbatch is somewhere in the negotiating / contract stage for the part. It is not official yet though, and things certainly collapsed in a similar late stage with the previous main Doctor Strange candidate Joaquin Phoenix.
I found this interview of Cumberbatch being asked about the Doctor Strange role and his reaction is pretty funny.
Doctor Strange movie: News, casting, rumors and speculation
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