While the storyline might have concluded, the Final Fantasy XI team has already revealed a preview of what’s coming in the next version update. From playonline.com:
The next version update is scheduled for early December.
Scheduled for the upcoming patch are further festivities in Geas Fete with powerful notorious monsters, and further steps in the aeonic weapon questline, culminating in the completion of the weapons themselves. New emotes and Unity outfits are on the docket as well!