CG Channel recently did an interview with Jeff Chamberlain and Fausto De Martini from Blizzard Entertainment on their new animated cinematic for Wrath of the Lich King.
It is a good read despite some of the fluff at the begin. I also recommend checking out the videos and pictures. They a great idea of what quality level Blizzard is working with. It is a great brief look at what goes into a production.