I don't know if this can be answered yet, but I know PvP will play a role in this game. I love PvP and plan to participate in several sieges. My question, will it be possible for a random player to go around and kill players for no reason? That wouldn't be fun for me. (if you've seen the WoW episode of South Park, thats what I'm talking about)

There is no FFA in this game, if that is what you are talking about. So someone from your own faction will NOT be able to kill you ever, but someone from a different faction can kill you no matter what you do.

Edit: And that episode of South Park wasn't true about WoW. You couldn't just kill people like that in the game.

At level 10 you can go to an area, that is VERY large and you could roam around and look for players from enemy alliances in there lands and kill them, there would be alot of enemy guards in those areas as well tho.