there was a bunch of bandit camps but there needs to be more, also I think more than likely the dragon fights will always be outside, I have no idea how they would handle that inside
I believe that one magazine mentions encountering a dragon in a dungeon, so I would say you can enouncter them in dungeons, though I can only assume it will be a different experience from fighting them outdoors since they wouldn't have room to fly around.
But I wouldn't mind a little more outdoor action, mostly for the sake of variety. I mean, past games did have combat outdoors, but it seems that like many games, the big fights usually took place in doors. Having more major outdoor fights could add a bit more variety to the game. Not only in terms of scenery, but it could also allow players to employ some tactics that might not work in dungeons as well. I could see things like battles against thugs and assassins in towns. This shouldn't be a common occurrance, because it annoys me when even in major settlements in games, I can't walk for five steps without being attacked, mostly this sort of thing should only happen during quests, though if you travel around at night in the less reputable areas of town, there could occassionally be people attacking you. When traveling, players could potentially be ambushed by bandits. After all, bandits don't just wait around in caves all day for someone to come and kill them, they should make an actual effort to rob travelers, because you know, that's what bandits do and all that. Bandits also don't need to always attack the player on sight, not that I mind if they do that at times, but I'd like to see more situations like the highwaymen in Oblivion, only they shouldn't be limited to Khajiit and shouldn't and up leveling glass armor due to level scaling and still try to rob you for a couple hundred gold. Also, in this kind of situation, I'd like to be able to try to scare them off, after all, bandits aren't suicidal, when they're wearing leather armor and carrying an iron dagger, you'd think that when the orc in full Daedric armor carrying an enchanted warhammer tells them that it would be in their best interests to leave him alone, they'd be inclined to listen.
Obviously, there should still be fighting in dungeons, I like fighting enemies in a well designed dungeon, just that there can be more action taking place outdoors too.