According to Variety on Dec. 11, a new trailer for the "Doctor Who" Christmas special is now available as a 30 second clip. The episode was specifically named "The Time of the Doctor" and is airing on Christmas Day. This would conclude actor Matt Smith's role as Time Lord number 12 while later on Peter Capaldi takes over the character in the next season.
The trailer opens with a narration by Jenna Coleman as there is a small tease as Doctor Who transitions his way into the next Time Lord as seen expressed by one of the Dalek's stating, "The Doctor is regenerating".
The event was made known during the "Day of The Doctor" 50th anniversary special on Nov 23. Also, Capaldi was announced on Aug. 4 to be next in line for the role.
Smith has been this character for around three years as his role brought about a younger crowd of fans and Capaldi is approximately 20 years older than Smith as he made his way around the internet via various social media venues.
American audiences will be privy to this special come Christmas Day at 9 p.m. EST.