It was a bit... 'a new Doctor appears!' :p
This series has kind of dragged for me, and had wasted potential...
But I thought that episode was fantastic, my most enjoyable for a LONG time! Possibly my favourite one of Matt Smith's era... all though I struggle to remember a lot of them right now. I thought he acted The Doctor brilliant in this one, demonstrating his age and lifetime of emotions. The visual effects were kinda cool placing Clara in the timeline. Great story/setting/build-up... and a fantastic dramatic cliffhanger.