NA and EU data centers confirmed.

[Mijin]

The Japanese have been pushing way harder for regional servers than we have. Use a translator and check this thread with more than 1000 posts: dedicated server for each language
I'll warn you before you read it though, there are some very racist posts.

A lot of you in this thread are really confused by what a data center is. A data center is just a place that houses servers.

These are the direct words from Yohida's mouth:

The players will have a choice of selecting a server based in their region or a server overseas

I really don't know how people are getting confused about this. It seems pretty clear to me. Either this is a horrible misunderstanding, or you guys are trying to make your wishes become a reality by believing they are true hard enough.