Yeah, there's actually been a lot of things they have said they are not sure about how it was going to end up. Some examples I recall include
-Horses/mounts
-Dagger sneak kills
-Arrow availability and damage
-Companions
-Dragons
-Final number of dungeons (has been said they are still working on and adding more)
-Perks
That's just off the top of my head from what we've heard.
In regards to the amount of dungeons yeah it keeps going up, at first I read there was 120 dungeons now in this new info they are saying its up to 140, wonder what it will be at by the time the game has gone gold?!! Just hope that they don't start to become generic, Oblivion was guilty of this and the dungeons didn't draw me in like I had hoped, after you had been in 20 or so they all looked and felt the same!
To the OP don't stress the game is still pre-alpha as others have pointed out, there is still lots of things to sort out and I will guarantee some of these things will be related to NPC reactions!