First off, if you haven't seen the trailer yet, here it is. Sit back, crank the volume up, and enjoy.
Wipe the drool away; it's disgraceful. You're meant to be grown up.
So it turns out that yes, you'll be facing off against another Dragonborn in this coming DLC. And even better, he used to be a Dragon Priest. The normal Dragon Priests were enough of a pain to deal with, so having this guy thrown into the bargain sounds like a great reason to look over your Daedric armoured shoulder again.
But not only that (and what made me the most excited) was what we saw at 20 seconds into the video. That's Morrowind. Yes. Morrowind. As of Elder Scrolls III fame. It looks like we're finally going to get to go back there again after ten years and see what two hundred years in the face has done for the already alien-looking place.
With Morrowind comes the wildlife that only Morrowind can have. Houses made out of giant crab shells, Netches, giant mushroom trees, and at 1.03, what looks an awful lot like victims of Corprus. This is going to be only so much guff to those who haven't played Morrowind, but it'll help if you think of this as Skyrim's zombie DLC.
It's not known how much of Morrowind has been mapped, or even if it's Morrowind at all (dream sequences and small islands are abound in the Elder Scrolls world), but even if it isn't Morrowind I'm sure I'll find a way to cope. On the back of my dragon-mount. Whilst fighting goblins riding boars. In new armour, with new spells.