The addition of new Worlds, as well as the adjustments to the duty finder servers, will be complete as of tomorrow. We will then enter our final internal testing phase of these features in preparation. If the results from these tests are favorable, we will conduct an extended all-World maintenance on Wednesday (Japan time). Once the new Worlds are implemented and the duty finder server load has been redistributed over smaller World server groups, we believe that many of the login issues that players are currently experiencing will clear.
Doesn't say anything about expanding server capacity.

Only new worlds and making the duty finder a smaller player pool.