Well, in the last game, I liked to have a house and put stuff in it and leave stuff outside of it too. But, I'm wondering if u do that now are the NPC's going to break into your house and steal your stuff and pick up your stuff outside or are they limited in some way?

They will not break into your house, Dev's said unless scripted to which I think means if a mod adds this not there is somebody in game who is scripted to. If you drop things on the ground around NPCs then they will often enough pick it up if it is useful to them, not sure if they will always do this but if you leave a sword on the ground by a NPC needing a sword they will definitly pick it up.

If something is lying outside your house that the NPC has a need or interest in, I think they would pick it up.
I hope there are no Loot Bags... I enjoyed decorating my house with Minerals, Swords, Armour and Cluuter and the vacuuming Loot Bags kind slowed everything down. I wouldn't mind if there was a longer loading screen entering a heavily decorated area or a larger save game file... as long as the place stays decorated!

I wonder if the NPC would actually STEAL stuff unless they are professional thieves or it is in a matter of life or death, considering all object being able to be marked with an owner in MW I'm pretty sure that will be the case in OB aswell. However, I wonder if the player is actually going to become the owner of not-previously-owned objects, that would be logical but not obvious.

Thinking of it, I wonder if NPCs can judge a situation being lifethreatening or not... THAT would be cool...