It has been reported on the BBC's "Doctor Who" website that Diana Rigg will be guesting in "Doctor Who" and her daughter Rachel Stirling will be joining her.
They will be in a story written by Mark Gatiss.
Little is known about the role but it will be airing sometime in 2013.
The story is here:
Now that we have the first complete series of "4th Doctor Adventures" released by big Finish. We've already had word that there will be a third series of releases.
For those that missed the news of this series here is a list of the releases in the first season:
1: Destination: Nerva
2: The Renaissance Man
3: The Wrath of the Iceni
4: Energy of the Daleks
5: Trail of the White Worm
6: The Oseidin Adventure
There was also the "Lost Stories" box set that came out in January which features two stories - "The Foe from the Future" and "The Valley of Death".
All these have Leela as companion and occur in the time-line after the story "The Talons of Weng-Chiang" but before "The Horror of Fang Rock"