WoW Insider's Lament of the Highborne video analysis
Two things that didn't make it into the commentary above in time: reader Lift sent us a bit of insight about Arthas riding an Undead mount– does that mean, he asks, that Death Knights will get their own Warlock/Paladin-esque mount? And one more thing we noticed– the spectre behind Arthas as he resurrects Sylvanas may well be the Lich King himself. By all means: discuss.