This is what Yoshi said. To me it means they will be setting up new servers in US and EU. Maybe all the current servers will become the JP region servers, and they will open up new servers for the other 2 regions. However you will be giving the choice to play on any regions servers your are not locked into picking a certain regions servers.[Yoshida] I'll explain this one. What we mean by multiple data centers is that, until now, all of the servers have been located in Japan. However, we will be setting up servers overseas as well. With this, the server communication lag will improve for each area.
I've had North American and European players complaining that they can't dodge the eruptions from Ifrit. They would tell me "I'm dodging it on my screen! It's not my fault!" It's probably not as bad for the Japanese players... Oh, I'm sorry. I guess it is bad for the Japanese players as well! The players will have a choice of selecting a server based in their region or a server overseas.
For me I would switch to a US server as soon as its available. I do not like the UI lag and the battle lag. Being able to move out of fire and not get hit is important to me. I am 3rd generation Japanese American myself, but I only know a couple words of Japanese, but still I don't have this need or want to play with JP players like some people do on this board. I might of had an exp party with a JP players like twice but that was about the extent of my interaction with JP players. For the most part they want to keep to themselves.
They aren't going to have 2 copies of each world that link up to Japan with mirror that just wouldn't work. Seems a lot of people on here are interpreting it that way cause they want to believe the way they want it to be.
If you have JP US, EU friends in a LS you still all can decide to play on 1 server they aren't forcing like a US player to play on the US servers. I am guessing they will probably keep the servers they have now as the JP region servers. People may pick a new server if they wish when ARR comes out I would assume.
People who are complain about dead time and nothing to do at off peak times. I played WoW I can log in at 3am queue up in the raid or dungeon finder and get a group just very easily. ARR will have a similar feature with the content finder so you can queue up and find other people who like playing at 3am or whatever off time you like to play at.