There's a big new mansion at Manor Mistmantle in Duskwood that looks like it's going to be a dungeon, although it's not on the list of dungeons that Blizzard announced for launch. If you've played through the Duskwood quests before, Manor Mistmantle is where Stalvan (of The Legend of Stalvan quest chain) lives. It's got a pretty neat haunted house vibe.

There's also the torch you can get in the zone (which they just made druids able to carry in their mouths in form!). It has me thinking they might do something like Karazhan Crypts again. I was surprised they didn't just port Karazhan Crypts over from SoD (though they might still do that too).