So:

Quote Originally Posted by Square-Enix
We are pleased to announce a long-awaited change to the Fantasia purchasing service. Beginning in mid-October, players will have the option to purchase Fantasia in desired quantities for individual characters. In preparation for this change, the current purchasing system will conclude on October 20 at 3:00 (GMT).

A separate announcement will be made prior to the recommencement of sales.
Source: http://eu.finalfantasyxiv.com/lodest...01de755b2725ab

In these days (21 October?) we will have the update.
"Desired quantities" starting from 1x I hope...