Ultimately, until it airs, we don't know what references or nods to the classic series it will show. I don't actually expect any classic Doctors to appear in new clips but before The Name of The Doctor, did anyone expect the clip at th start with all the classic Doctors? I anticipate little nods like this.
Not only was it unexpected, but, that kind of thing has always been "pooh-poohed" around here, because of the difference in quality of the film clips, "They'll never insert older clips, or insert new actors into older clips, because it would look awful in today's HD"
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?