All the rumors we've heard over the last couple weeks are true, from the name of the expansion itself, to the new races, the new class/race combos and many other new features.  It seems that Blizzard is about as good at keeping a secret as Sony.  I no longer play WoW, but the trailer below got me all excited again.  Not that I plan on going back, but you never know.  Here's a break down of some of the expansion's new features, but this most definitely isn't everything discussed yesterday at BlizzCon.

• Two new playable races with their own starting zones and class/race combos - the Worgen for the Alliance and the Goblins for the Horde.
• New race/class combos - along with the new races, which spread out the class love a bit (Worgen druids, for example), many of the current races will be able to take up new classes from the start - Human hunters, Tauren paladins, etc.
• Level cap increased to 85.
• Guild advancement and guild-specific achievements.
• Classic zones remade - a few zones won't change all that much (especially starting zones), but most will be changed significantly.
• Flying mounts in old Azeroth - all zones in old Azeroth will be updated to support flying mounts (a most requested feature!).
• New PVP and Battleground zones (of course).
• New high-level zones.
• More raid content than they've had in an expansion for a long time.
• New secondary profession - Archaeology.
• Heroic Deadmines - what more could you ask for?

It seems the story revolves around Deathwing's return.  I'm not sure how much lore they're shuffling around to make the Goblins and the Worgen join the faction that they are, but I haven't been much of a lore junkie anyway.  I also understand that, just like in real life, allegiances and circumstances change through the course of history, I don't see why that couldn't transfer over into a game like WoW.  Also of note is the fact that they're not increasing the level cap by 10 levels again like they have in the past two expansions.  Perhaps they're starting to build more horizontally than vertically, eh?

Needless to say, as a former WoW player, this expansion looks incredibly exciting.  Only time will tell if go back to my Tauren druid and Draenei mage or leave them lost in the nether forever.

Here's a massive amount of screens released yesterday of Cataclysm areas and playable races, as well as a video of the first trailer, shown at BlizzCon yesterday morning.