Gungnir wont be Gungnir if they dedicate it a JP or a NA server, how do you not understand this?
all current servers will be JP servers, because that's where they're located, but they will still be "anybody" servers because people from all regions are on them already and they don't have to switch servers if they don't want to. gungnir will still be gungnir because nobody is forcing you to move to a different server. Every current player on every current server is still totally welcome to stay on that server. the fact that it's located in Japan doesn't prevent that. THERE IS NO REGION LOCK.