Speaking to this months Torchwood Magazine, Creator Russell T Davies has revealed a brand new character that has so far remained unleaked. Alongside Jack, Gwen, Rhys, Rex, Esther and Oswald who we have already learned will be appearing, is a brand new Doctor called Vera. Russell Had this to say:
"There's a great new character called Dr Vera Juarez. She's almost the fifth member of the team. I'm imagining Vera as mid-30s Latina, but that could all change when we get to casting."
Little else is known at the moment, and this little bit of information isnt exaustive, but any bit of news is good. Once again, thanks to @hannahcole93 for this information