Im actually looking forward the Vampire's, even going to make a Vampire Hunter and everything.

I think Bethesda is genious, extend Vampires, and Magic, while still adding new armours, weapons, and powers to the game.
Even if the DLC is only 1/3 (I suspect it will be more like 2/3) of Shivering Isles, then i like it!
See here is something to remember guys. Back when Shivering isles was made, Bethesda was alot poorer, and had half the ammount of people they do now.
That means they can get more done now, and put more money into the DLC's. That could mean alot of big dlc's.