I downloaded the 2010 Doctor Who Prom it's pretty cool and I wish I could've been there. Here's a link to the description:
http://en.wikipedia.org/wiki/Doctor_Who_Prom_(2010)
I too am excited to see who the little girl at the end of the episode turns out to be. First thought is River Song in some form or another but that seems to easy or maybe I just haven't thought it through enough.