2. Nothing Special
Kittens are, in fact, special, but not Doctor Who level of special.
THE WISH Back in 1978, the show had its fifteenth anniversary. They celebrated bydoing a normal episode. In 1988, they had their 25th anniversary and celebrated bydoing a kind of crappy normal episode (Ace kills a Cyberman with a sling-shot? Really?). In both cases, there were little throw-away lines recognizing the significance, but otherwise these were just normal episodes of Doctor Who, and werent caught up in the larger continuity or anything grand.
ODDS OF THIS HAPPENING Zero-point-zero-zero-zero-one. Maybe. Moffat has pretty much already said theyre doing something special, and I cant say as though Id blame them. But frankly, if I had to pick between a special episode like The Five Doctors and a normal one like The Empty Child/The Doctor Dances, I know what Id pick. Quality is ultimately most important, and an anniversary special could easily get caught up in its own importance and thus forget to do a good story. It happened before. Hopefully it wont happen again.