Surprised no one has posted about the 50th Anniversary episode "The Day of the Doctor". This was an excellent episode that I'm glad explored the Time War and just where John Hurt's Doctor aka The War Doctor fit into all of this. Loved the interaction between Doctors 10 and 11 and it was epic how they made Gallifrey simply disappear rather than destroy it. I was really delighted to see Peter Capaldi's upcoming 12th Doctor get in on this action (though we only saw him from the bridge of his nose and up).
If I had only one disappointment, it was not having Billie Piper reprise her role as Rose. While a manifestation of Bad Wolf worked here, don't get me wrong, I would have liked to have seen the interaction between Rose and Clara as I think it would've had it's own dynamic along with the companions' respective Doctors.
The biggest surprise to me was at the very end where the 11th meets the museum's curator and it's Tom Baker. While I speculated that there would be a previous Doctor actor in this one than David Tennant, I could not have in any way imagined that Tom Baker (the 4th) would be in it. His scene with Matt Smith left an open interpretation as to just who this curator really was as the Doctor "never forgets a face".
I'm glad that during the time leading up to the 50th Anniversary that Stephen Moffat (who I've knocked quite often in the past) has tied up all the loose ends between the 1996 TV movie and the series' return in 2005 concerning the 8th's regeneration ("Night of the Doctor" with a treat performance from Paul McGann), the Time War, and the circumstances that lead to the series' 9th Doctor. Great job all of those involved.