Well so far, i just see a MAJOR improvement, visually ofcourse.
The customization options seems to be less.
The animations is really flawless now aswell, it actually looks good when you jump..
Best thing is that they brought dragons back, wonderful.
though i just get the feeling skyrim wont be the game you can play 6 years after the release.
It all depends though, the weapon of choices, skills, spells, guilds, characters etcetc.
Im having my hopes up, but ive been waiting for a new TeS since 5 years back i think.
Sigh, dont break my heart.