The Day Of The Doctor Trailer To Air On Saturday Night

BBC One have confirmed via their official Facebook page that the first official trailer for the Doctor Who 50th Anniversary episode, The Day Of The Doctor, will air on Saturday night just before 8pm.
BBC America have also stated on Twitter that they too will air the trailer on Saturday.

The Day of The Doctor sees David Tennant return to the TARDIS as the Tenth Doctor along with companion Rose, played by Billie Piper. They join Matt Smith and Jenna Coleman as the Eleventh Doctor and Clara, along with John Hurt as a dark and unknown incarnation of the Doctor. Plot details released this week reveal that the Doctors must face a murderous plot and an ancient battle in their greatest adventure in which all of reality is at stake. 
The Day Of The Doctor airs worldwide on Saturday 23rd November.