yh. I am hoping for a big realm added on the next one - A section of Morrowind to the east or maybe Orsinium just to the south.
Doubt the next one will be huge, but I could be wrong. They probably are working on a huge one, though. Why do I suspect this?
1) They built the entire game and all it's content in only a couple years, but Dawnguard took 7 months. This implies most of the content builders were working on something else.
2) Microsoft has a timed exclusive on the first two DLC. Bethesda will probably want their biggest expansion project to hit the entire market at once, so those first two are likely to be smaller in scope.
3) The speculated name of the next DLC,
Hearthfire, doesn't exactly scream 'big'. Sounds small and cozy like horse armor, not big and amazing like the The Shivering Isles.
I've been wrong before, though.