Sigh, someone had to mention L2. I loved me some L2. Then again I jumped ship on the retail servers when I discovered L2 Paradise and found that L2 could be both extremely enjoyable to play and a beautiful game all around. Unfortunately it became so popular, NCSoft had it shut down. Anyways, I dont really see WildStar having any sort of open pvp system where anyone can attack anyone. I think you will see pve shards and pvp shards where pvp is faction based. Hopefully we will have 3 or 4 faction so that pvp can be more challenging and perhaps we can see some rvr type pvp zones like they had back in DAoC. Thats probably wishful thinking but this early in development it might not be too late to push for something like that.