I must say that Skyrim's movement animations look damn good and I think I am going to want to play 3rd person most of the time while I'm travelling, using only 1st person while talking to someone or fighting something/someone. You?
Yea, I play 3rd person 75% of the time in Oblivion, and Skyrim will be no different. I even do bow & arrow fights and magic in 3rd person, as I grew up with tabletop RPGs and lead figureines, and I like seeing this perspective in a videogame.
I only switch to 1st when I need to get a better look into a room, or to find an object I've dropped, etc. If I used 1st all the time, I'd always hit (especially long-distance attacks) which gets boring.