What I want from the 50th:
I just want K-9 to be a part of the 50th anniversary because he’s an iconic part of the show, and there needs to be a Sarah-Jane reference in there, in homage to one of the best companions ever. The Doctor could ask why Sarah wasn’t there and K-9 could break the bad news.
She deserves at least some mention during this milestone, because she’s been there for so many Doctors.
Rest in peace, Lis Sladen.