Bungie has definitely confirmed that competitive gameplay will definitely be a major element of the game. We currently don't know how it will work entirely, but I can imagine some implementations for how to do it. PvP would not be restricted to certain areas, but rather, it would be a gameplay option. I can cooperatively go on a raid and ensure that the only people shooting at me are the enemy AI, or I can choose to do the same raid competitively, and there is no guarantee that the players that I meet won't want to kill me. With the added risk, comes added rewards, which would make this mode appealing to anyone who has confidence in their skills I just see no reason to restrict the PvP to certain areas when all you have to do is turn off friendly fire and you've got yourself a firefight :) From what I understand Campaign is Multiplayer. There is no point in the world where you can't encounter other characters (probably), you might be pursuing some Cabal as part of a Campaign Mission, and see some players chilling out on some rocks as you speed past on a Pike. Does that sorta make sense?

[url]http://destinypedia.wikia.com/wiki/Destiny?file=Destiny1.png[/url] This picture is as much as we know really, and it sounds like this'll be the only menu screen in the game. They've got faction wars seperate so it looks like while it will be merged in the sense that your character will be the same, the PvP will most likely be taking place at a location away away from the main game elements.