Another thing I'd like to see is a multi-Doctor special where the Doctor meets a future incarnation, like "The Next Doctor" but for real. Like, I imagine Matt Smith announcing that he wants to leave the show. They decide that his departure will be in the middle of the season instead of at the end. This way, they would have to cast the replacement somewhat in advance. Early in the season (like episode 1 or 3), they show the 11th Doctor meet the 12th Doctor. Then you'd have the regeneration sometime around episode 7. Then, after some other adventures, towards the end of the season, you see the multi-Doctor story again but this time from the 12th Doctor's perspective.
That's not going to happen, the tallk at the start of filming was that they were going to film for a year, filming two seasons and there's been no official talk of Matt Smith leaving the show.