From the WoW Frontpage:

March 4:
New World of Warcraft Cinematic Feature Coming Friday!
Ever wonder what a Blizzard cinematic movie looks like at the different stages of development? On March 5th, we will be releasing a brand new movie featuring a behind-the-scenes glimpse of World of Warcraft’s opening cinematic. This rare look at a Blizzard movie in progress will be available for download at Blizzard.com starting at 6pm PST this Friday. We hope you’ll stop by to check it out.

Read more about it here (http://www.battle.net/forums/wow/thread.aspx?FN=wow-general&T=1325541&P=1&ReplyCount=70#post1325541)