One thing, it appears as though you are basing the idea on the snow elf prince on the patch that said something about
him being in DLC 01. I doubt they will make two snow elf DLC's. Which daedric lord is in dawnguard?
I can't remember which, but according to Game Informer you'll be traveling to an Oblivion Realm called the Soul Cairn. I would assume
which ever Daedroth is most associated with Vampires, or maybe a new one that doesn't already have a quest in game. I would like
the latter better though. But if it is a Daedroth that has a quest in game, and you did the quest, I hope the have special dialogue when you
talk to them. When I heard Sheogorath was incharge of the Shivering Isles in Oblivion, I went to go do his statue quest to see if he would
sy anything, and I don't think he did.
Also, they could if they wanted to. Morrowind had a Snow Elf related dlc, and Skyrim has better claim to the Snow Prince than
Morrowind, seeing as he use to live in Skyrim and they won't have to add a new island to the game to get him in game.
His association with DLC 01 could simply be something of an Epilogue where he's added to the game buy his events aren't upon
us yet. OR maybe Dawnguard wasn't suppose to be DLC 01. Maybe DLC 01, whatever it maybe, became something much more
than they planned. It got bigger than Dawnguard so they decided to switch releases, because they decided to release the "smaller"
one first or it got so big its going to take longer than they thought.