From the last producer letter:

http://forum.square-enix.com/ffxiv/threads/58629


"What about future additions, you ask? Well, stability tests for Phase 3 will continue until December 2. We will resume adding testers from the day after, December 3. Now, this wasn’t actually part of our original plan, but in order to handle the additional server load, we’re going to open a third alpha world that same day."


... Let's cross the fingers.. again