The trailer from Blizzard Entertainment for WoW's Patch 3.2 - Call of the Crusade.  

The trailer itself is made up of mostly in-game footage of the various events in the new dungeon, the Argent Tournament. We see some boss fights in the coliseum raid, a few overviews of the tournament grounds, etc... The new Battleground, the Isle of Conquest, is also featured in the trailer, and there are some good shots of PvP going on there.

There isn't really any lore or story to it - other than that the Argent Tournament is preparing us for Icecrown Citadel. Nothing we don't already know.