At the end of season 9,
Clara and Me (Ashildir) left the Doctor with a brand new stolen TARDIS (in fact, not really a TARDIS 'cause the Doctor's granddaughter didn't name this particular one :D). Now, we have one immortal girl and a dead one, travelling through time and space.
So, are there any plans for them to come back in their own spin-off series, like Sarah-Jane did? Or are there plans for
to become a recurring character?
I'm looking for official information which would support any rumors.