Greetings,
Apologies for the rather hefty post, but please find responses below.
Exactly right, Zebyxus!
Just to confirm for everyone, when pre-ordering from the European SQUARE ENIX Store you should receive an Early Access code in a separate email within 30 minutes of placing your order.
Once these are sent, you can retrieve your code by logging in to the SE Store, and going to the SE Web account control panel here: http://eu.square-enix.com/en/account
However, these Early Access codes cannot be registered on the Mog Station until closer to the launch of FINAL FANTASY XIV: Heavensward on June 23, 2015.
You will receive another email at a later date notifying you when your code can be redeemed.
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The process slightly differs depending on region and retailer, but for orders on the European Square Enix Store, you should be sent an email containing an early access code for each copy purchased.
You can also retrieve your codes by logging in to the SE Store, and going to the SE Web account control panel here: http://eu.square-enix.com/en/account
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Full details on delivery rates for the European Square Enix Store can be found here.
As other players have pointed out above, free shipping is available for boxed/physical games from the EU SE Store.
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This was also mentioned during the special Letter from the Producer LIVE last weekend, but a digital collector's edition upgrade option will be available later: