OK... I have a theory.
John Hurts character in 50th special.... its the Dr....
various theories floating around... but I think its THE Doctor in ALL his regenerations combined.
If you look at the outfit its an amalgamation of lots of previous outfits.
What else do you think?
Could be... I have another one for you... She saw all the doctors regenerations, as did we... Apart from McGann. What if Hurt is playing a much older 8th doctor?