http://www.doctorwho.tv/whats-new/article/11-things-we-loved-in-the-doctor-who-50-year-trailer/ 11 easter eggs in the 50th preview...
Happy 50th Dr. Who! I only ever saw one entire episode, the one about gargoyles from the early 70s. I saw it on PBS about ~25 years ago now. It was a pretty good story/episode.
There's been a few crossover episodes. Not sure why these two got the shaft. (Although I always disliked the Colin Baker years so no great loss IMO.)
Two of my favourite things come together, Brian Cox and Dr Who http://www.bbc.co.uk/mediacentre/proginfo/2013/46/the-science-of-doctor-who.html
And now it's going to be available to watch live in 3D, in theatres all across the world. You can find out if your city is doing it at the link. http://www.doctorwho.tv/