Howling:The Valeyard: The Second to Last Doctor

"The Valeyard is an incarnation of you between your twelfth and final incarnations" Well, the doctor now has a new set of regenerations. My suspicion is that one of the later doctors, realizing that he is running short on regenerations, will start going by the Valeyard and trying to kill all of his past incarnations after 6(since six said if he died, all the Valeyard's regenerations would be his), to steal their regenerations.