Maybe if you actually, you know, read the news on the first page of the loadstone from time to time you'd know the answer...

To address this matter, we are currently working on introducing new Worlds and enhancing the performance of the login and match making processes on both the Japanese and North American & European data centers. This operation is expected to be completed at the beginning of next week.
from here which can be found on the front page of loadstone...

http://na.finalfantasyxiv.com/lodest...1308da98f95947