This is the ending Cinematic for the Fall of the Lich King, after you kill him. Blizzard has been pushing really hard to get this video off of YouTube. I really have no idea why. They included it as part of the download in the last patch. Any fanboi can see this without completing the dungeon.

(Warning: This does contain MASSIVE spoilers, if you do not wish to be spoiled do not watch.)

(Note: doesn’t seem to work in Chrome, Or some versions of Firefox not sure why, but if you have WoW installed and updated, you already have this video.)