here. But my favorite contenders are:
Andrew Scott, Moriarty from the Sherlock series. I'm starting to think Moriarty is really dead, and the photos of him with Mycroft are from a flashback sequence (Keep up, people). He would be a great Who. He is fantastic. He knows Steven Moffatt because Moffatt is the showrunner for Doctor Who and Sherlock. If Andrew Scott is the 12th Doctor, I will be in heaven.
Or: Ben Whishaw. He played Q from Skyfall and Freddy from The Hour. I love him. He's already got Who-hair. This guy would be a perfect #12. Whishaw says it's not him, but I'm still holding out hope.
Some people are guessing the next Doctor will be Rupert Grint, a.k.a. Ron Weasley. Maybe. The Doctor has always wanted to be a ginger.
Whatever the case may be, we are in for a treat with John Hurt playing the "dark doctor" or, as I like to call him, the Rogue Doctor. (#roguedoctor, roguedoctor.com). He is a regeneration (probably between #8 and #9) that did something unspeakable/shameful which makes him unworthy to be called "The Doctor." I doubt he will be purely evil. I'm guessing it's more of an ends-justify-the-means scenario, but I am eager to see it. When his face came on-screen at the season finale I totally gasped. I mean, it's John Hurt we are talking about—The Elephant Man and Ollivander the Wandmaker.
So yeah. It's kind of a big deal. He'll be in the 50th Anniversary episode which also stars David Tennant, Matt Smith, and Billie Piper on November 23rd. Cooooool.