Well according to Deadline Benedict Cumberbatch is Doctor Strange, but Marvel seems to be hinting that they are incorrect. Since Marvel hasn’t outright said Deadline is wrong, I am going to guess Cumberbatch is the Sorcerer Supreme and they are just trying to cause doubt before their big reveal.
Benedict is a fine actor, and I am sure that he will be great in this role, but I am having a hard time picturing him as Strange. Sure the mock-up by Anne Wu helps, but the thought of Cumberbatch with a Van Dyke is throwing me off, and I hope he doesn’t just play Strange as Sherlock with magic. We will see how this all turns out, and since Marvel has been on a role, I am going to trust them on this.