*important* pls note this.
You will receive the pre-order items, but the registration code for the Windows collector's edition cannot be used with a pre-existing Windows service account. To receive the in game items for the collector's edition, please use the digital upgrade.
Legacy status accounts are still treated the same as standard edition accounts in FFXIV:ARR, so If you have no interest in the physical items that come with the collector's edition, and have no intentions of playing on the PS3, using the digital upgrade will allow you to receive the collector's edition items with your current account.
A Square Enix account can hold up to 8 separate service accounts, but it should be noted that the pre-order bonuses can only be tied to a single service account, not to the entire Square Enix account.
If you purchase the collector's edition and register a new service account, your legacy account will not receive the collector's edition bonuses.
The collector's edition bonus items are included in the product code, so any registration of the product code to a specific service account would include all the bonus items solely to that service account. Pre-order bonus item codes however are separate and can be registered to any service account.
To simplify, if you own existing ffxiv 1.0 and wish to use CE box with your account, you need to buy PS3 versions and not PC versions! If you do not want the box items, and want in game items, just upgrade your copy to CE version later on.
Ya read that, lol. doesn't effect me, but for those who are standard 1.0 need to see this.