UPDATE: Our spoiler fun is over, everyone. Blizzard has had the cinematic pulled from YouTube. If you didn't get a chance to see the video yet, you'll probably have to wait until some players are able to take down Arthas in-game and rerecord and post the video. Alas!
ORIGINAL STORY: Okay, I know this video is not technically the ending to World of Warcraft. WOW is an MMO, and MMOs -- particularly MMOs as successful as this one -- never end. But this newly-leaked in-game cinematic from WOW.com could be viewed as the ending to the Wrath of the Lich King expansion, since it's presumably the reward to players who finally bring down big bad Arthas in the game's final planned raid, Icecrown Citadel.
For those who are raiding in World of Warcraft and plan on taking on the Lich King yourself, I want to stress that the video below has MAJOR SPOILERS. That said, if you're someone who played Warcraft III and its expansion, The Frozen Throne, and have always wondered about the final fate of the fallen Prince Arthas, here's your chance to find out.
Not enough spoilers for you? WOW.com has also posted a video full of audio from the last few Icecrown bosses and quests. This includes voiceovers from Sylvanas, Jaina, Uther, and several more key Warcraft universe characters.
For those who held off on watching, congrats and good luck downing Arthas! For those who gave in to the temptation, what do you think? Was this a fitting end to the character who's probably become the biggest bad guy in the Warcraft universe over the past 10 years?
[Special thanks to @kathunter for the tip.]