During the season 9 finale "Hell bent" the Doctor
overthrows the Lord President Rassilon in what amounts to a military coup and becomes the new Lord President. This state of affairs is short lived however as the Doctor breaks a bunch of laws to save Clara and flees Gallifrey again.
My question is who is in charge now?
The most likely candidates are probably the General or Ohila, High Priestess of the Sisterhood of Karn.
Not sure if this info exists yet, but hoping Moffat might have said something.