Servers are usually always the same minus games with shard servers such as guild wars. Most of the time they do not IP lock a region to servers its just not ideal for a twitch/TPS type game to choose a server farther from where you live.
Would you really want to go up against a player in NA while living in EU with the servers being in NA? Your latency could be 300-400 ms thats not including hit registration with the other player.
Best example was playing Tera online in korea from America and seeing the natives attack twice as fast as me because of the connection distance and ping. It was great for PvE style, but for PvP you would be destroyed.
I belive that during the reddit interview the devs said something about this, if i recall they said that you wont be choosing a server like the traditional games, but you rather connect to a cloud or something(im not that into the technical jargon) and you play with anyone. Also i have heard said in an early(from E3 i believe) interview that they wanted everyone to be able to play with everyone regardless of place of origin. How this works and the actual physical locations of the servers i dont remember reading about.