Doctor Who Executive Producer and Head Writer Russell T. Davies to Doctor Who magazine that there will be two new alien races introduced in the Planet of the Dead special.
“After the events of Journey’s End and The Next Doctor I think it’s time to get away from the past and have an adventure with lots of new elements. And lots of fun too!
“The next Special should be a nice antidote to Christmas, with a bit of sunshine if we’re lucky. And with not one but two alien races that you’ve never seen before.”
I finally had the chance to watch the most recent Doctor Who Christmas special, and it was a bit of a downer, so this news has me itching to see new Doctor Who.