According to Tamat, players will be given an opportunity to purchase the Collector's Edition Upgrade for a short period of time, beginning October 29, 2009.

Due to an internal error that caused availability of the Aion Collector’s Edition Upgrade to end early, we’re restoring the ability to upgrade between 12:01 a.m. PDT on Thursday, October 29, 2009 to 11:59 p.m. PDT on Friday, October 30, 2009 (more). Please keep in mind that this will be the last opportunity you will have to upgrade to the Aion Collector’s Edition.

During the above listed 48-hour period, upgrades to the Aion Collector’s Edition will cost $10.00 USD and will include the digital in-game items found in the physical Aion Limited Collector’s Edition box.

Obtain additional information and  follow the discussion here or on the official Aion forums.