Yes, yes, old news for some. For those of you among us who haven't yet experienced this particular quest line, of course, it's not to be missed. For those who've seen it in-game already or who just can't contain themselves, though, you can stream the incredibly spoiler-heavy cinematic in full HD on Blizzard's site now or download it directly from BigDownload. If you're into it, there's also a nice short story/summary of the momentous events directly under it.
We can hope for two things--that Blizzard continues to put these kinds of awesome scenes in the game, and that when they do, they give those of us with nice monitors/TVs the ability to watch them all pretty-like.