Doctor Who showrunner Steven Moffat has revealed some more details on Matt Smith's regeneration in the upcoming Christmas episode to Ain't It Cool News. Moffat had this to say about The Doctor's upcoming regeneration.
"His appetites and his enthusiasm will change. And that’s sort of what I’m writing about now in Matt’s last episode, the fact that he’s terribly aware that he’s about to be rewritten. And it’s frightening..."
It sounds like Moffat is once again going to do another form of fourth wall breaking with this regeneration. Makes me think of David Tennant's last episode with his final words being, "I don't want to go," which made sense in context of the actor, but in the show was kind of a weird thing to say, seeing as he is technically the same person. What will Smith's final words be?