James Corden will definantly return this series, and episodes 1, 2, 7 8, and season finale, episode 13 will be written by Steven Moffat. The Episodes are rumoured to be called House Call or Night of Terrors. Also, Matthew Graham brings in the clones for a special STAR WARS spin-off!
It is now confirmed that David Walliams will appear in Episode 11 as a character called 'The Gibbis' and that James Corden will return as Craig Owen.