OK, so I'm going to assume that you've all seen the Lich King cinematic at least nine to 14 times by now. If you haven't, go find it and watch it. The blog will still be here when you get back.
OK, so I watched the darn thing at least three times, then went back and watched the WoW and BC cinematics to compare them, and I will say that the Lich King version is very quiet and lore heavy compared to the older versions. Here's a brief comparison.
WoW: There was some war four years ago and the Horde and Alliance whipped Archimonde's butt. Now the Horde and Alliance don't like each other anymore and... that's it. Go have fun. Oh, and there's a really dumb Mage casting fireballs at an Infernal, who are IMMUNE TO FIRE!
BC: There are some new guys on the block. One race is huge, blue, and has tentacles on their faces. Oh, and they can be Shamans, but you'd never know it from the cinematic since they are portrayed, correctly, as a culture of Paladins. The other race is apparently all waifish girls with green eyes who are priests. Oh, and they can be Paladins, but you'd never know it from the cinematic.
Now for lore. Illidan is super emo, pissed that you're coming to Outland, and doesn't think that you are prepared. Slightly more lore than the WoW cinematic, but still not much.
LK: Man, Northrend is cold. Really really cold. And snowy. Did you see all that damn snow? And there's a dragon. Damn. Did you see that huge frostwyrm? That thing was huge!
Oh, right. Lore. Um, Arthas's dad was the King of Lordaeron, making Arthas the... you guessed it. The Prince. But Wrath of the Lich Prince doesn't sounds so good, so back in Warcraft III, Arthas went and, spoiler alert, killed his dad. Gasp!
So now Arthas is the Lich King and he has a huge army of the undead and... well I have no idea what he's going to do with it. It's just kind of there according to the cinematic.
Oh, and the epic battle between Horde and Alliance that was portrayed in the previous cinimatics. Nowhere to be seen. There is apparently going to be no PvP in LK. Hell, not even PvE, since there's no fighting between the Scourge and the Horde or Alliance either. It is now official. Wrath of the Lich King will feature no PvP or PvE, but lots of snow.