John Simm will also return to reprise his role as The Master and will likely be responsible for The Doctor regenerating into his eleventh incarnation (Matt Smith).
Tennant is due to play The Doctor in four specials during 2009 before he leaves the show, while Steven Moffat will replace Russell T. Davies as executive producer and head writer in 2010.
April 6 UPDATE : 'SPOILER' JOHN SIMM SPOTTED ON SET DURING FILMING OF DOCTOR WHO FINALE (Click Pic To Enlarge)
