He was spotted in filming photos this morning (check out the #DWSR hashtag on twitter if you don't mind spoilerish pics) but the BBC have now confirmed that Joivan Wade is returning as Rigsy ("Flatline") in episode 10 of Series 9 which is written by Sarah Dollard ("Being Human", "The Game"):
Filming has begun on episode 10 of the new series of Doctor Who and Joivan Wade, who played Rigsy in last year’s Flatline, is back! The episode is directed by Justin Molotnikov and written by Sarah Dollard whose previous credits include Being Human and the BBC’s acclaimed spy drama, The Game.
Sarah commented, ‘Getting to play in the Doctor Who toy box is a dream come true. It’s a total honour to contribute to a show that has brought me such joy as a fan. However, writing for Peter Capaldi and Jenna Coleman has presented a serious problem: some days I've been too excited to actually sit down and type!’
The episode sees the return of Joivan Wade as Rigsy, the young graffiti artist who helped save the world in Flatline. He’ll be reunited with the Doctor (Peter Capaldi) and Clara (Jenna Coleman) in this new adventure although how and why he finds himself mixed up with the time traveling heroes is currently under wraps!
The guest cast for the new series includes Maisie Williams, Michelle Gomez, Rebecca Front, Rufus Hound, Paul Kaye and Jaye Griffiths.