Snow. You forgot this one.
But, yeah...
Kinect - No thanks. I can think of FAR more important things on Bethesda's list. Besides, it's more of a console exclusive thing, anyway.
hardcoe - Yeah, but more in-depth. Necessities of Morrowind is a GREAT example of how it could be implemented.
Economy - Definatly. Been saying this since forever. Never done too well, except, perhaps, Daggerfall.
Larger Game World - Eh, I suppose so. Being bigger would be nice, but what we really need is the ILLUSION of a bigger world. Mountains should block my way, roads should be slightly sunk into the ground, etc. ala Morrowind.
Co-op - Well, it's not NEEDED, but I would really love it. I'm going to vote Yes, anyway. TES has great potential for co-op, as long as the game stays as it is, and isn't tailored for it.