And what part do you want to be expanded upon?

My favorite part would be the Daedric civilizations. Like Dremora and Aurorans.

The thing I want expanded most would be the Magna-Ge pantheon, and what is in Aetherius.

Favorite lore: anything related to Morrowind. Nerevar, Muatra, that kind of stuff.

I'd like to know more about http://www.imperial-library.info/node/2234 and yes, Aetherius.

The civilizations, cultures, and politics of Tamriel.

The notion that creation is subgradient, that in short everything becomes smaller and more numerous over time.
Coupled with the notion that the Mundus is a tool for ascendance, an effort to reverse this fundamental constant of the Aurbis.

I've become increasingly obsessed with the remnants of Yokuda, the Eltheric ocean, and Thras as of late. I would like to see them fleshed out and get to explore them in a DLC, or more likely, an adventure game.

The Imperial civilization and empire even though there isn't much of an empire now though I wouldn't know too much since I haven't played Skyrim yet but they're my favorite race and their Aedric gods. Also the Tribunal demi gods and the Temple was most interesting and I liked Vivec or else called Vehk the most since Vivec seemed so slick to me.