While Rivers was trying to fly the Tardis, she told the Doctor someone else was flying it. Does anyone have any ideas who that was. Could it be a future Doctor? Or, is there another force capable of controlling the Tardis?

You know, I'm actually thinking it's somthing to do with the Dream Lord. Because at the end of that episode his reflection changed and I kinda felt like they were leading up to something. Just a hunch.

i reckon the TARDIS is controlling itself. Maybe it is tired of The Doctor's actions. Even though he has good intentions, people always die for him. Plus, the TARDIS has been with him from the start and since it's a living being, it should know every one of The Doctor's secrets. It could become the bad guy of an upcoming season, by becoming a time lord somehow, maybe by absorbing the lifeforce of Captain Jack.