http://www.guildwarsinsider.com/2012/01/guild-wars-2-pvp-roundtable/2/
GWI: Do you have an idea of how many people are in a WvWvW?
Jonathan: We’re estimating right now that we’ll be able to get about 500 people into each map.
Matt: Since there about 4 WvWvW maps, that’s about 2,000 players in total. So we have a pretty large capacity but we still haven’t done a whole lot of optimization passes either so we’re hoping we can get that number a little higher. We’re just estimating 500 as our cap right now.
GWI: I’m not too sure how much you can say about WvWvW, but what can you tell us a little about Keeps?
Mike: The keeps are a much larger space in comparison to the Kylo PvP map, and they all have unique terrain features. One keep climbs up the side of a mountain while another is based around a lake; so you have some underwater entrances you’ll need to defend.
We have towers, which are basically like smaller versions of keeps. They’ll have a couple of walls and a door you can bash in so you can try and take over.
We’ll have resource camps, which are more of an “open field” style of battle. They’ll have a capture point in them so you can fight for control of the resources.
GWI: In maps like Kylo, the environment plays a big part of it. Anything else from a WvW standpoint where you can just knock something down, take out a bridge even?
Mike: All the keeps and towers, we talked about, have walls that can get treb’ed down or you can break those down. You’re bashing through doors all the time. We’ll try to add more of that stuff but we definitely want to have the environment play a big part.
Matt: We’ve seen it a lot too. In closed beta there’s been countless times where keeps are getting attacked and you roll up on this keep that you anticipate that’s going to be this awesome epic defense, but your just a little too late. Now you have your keep’s gate down, you pushed them back, but then they get on the Trebuchets. Now there’s holes in every wall and they are just pouring in in.
It gets to the point where you slowly go “Ok, what are we really defending here?” At this point its completely destroyed. So, things can break down fast and change the course of action.