Captain Nebula wrote:
One of the articles I read (don't remember which one or where) said that Hurt is going to be the 9th Doctor and that everyone else is being shifted making Matt Smith the 12th Doctor. They're supposed to explain it on the show.
That was the rumour being reported before The Name of the Doctor aired. That episode made it clear that Hurt is an incarnation of the Time Lord known as the Doctor and is implied to be an incarnation that comes before the Eleventh, given he is spoken of in the past tense. And despite the final scene saying "Introducing John Hurt as the Doctor" this incarnation wasn't actually considered to be the Doctor, therefore they don't have to adjust anyone's numerical identification.
If he is indeed somewhere before Smith, than the only options are pre-Hartnell (which could tie-in with the other faces seen in Brain of Morbius) or between McGann and Eccleston (since that's the only other gap he could fit in).