Vous en réviez... Blizzard l'a fait, le collector Options

Le détail du coffret, en anglais.

Un vieux post sur le forum US :

Collector's Edition 10-Day Guest Pass

Players who will be accessing the game through the 10-day pass will create their account for that exactly the same way as a normal player, by visiting the account-creation webpage.

Those who wish to continue playing the game once the 10-day free period is over must first visit their local retailer or online store to purchase a copy of World of Warcraft. Once they have obtained a copy of the game, they can log in to WorldofWarcraft.com using their 10-day pass login information and then enter the authentication key that came with boxed copy into the field found at the bottom of their account page.

That's all that's required to activate a full-fledged World of Warcraft account once the 10-day free period has expired. Any characters that players have created during the 10-day trial, along with all their items, will be available for them to continue playing!

Je ne suis pas super doué en anglais, mais je comprends qu'il faut absolument avoir acheté la boite pour jouer, mais que les persos créés lors de l'essai seront gardés ... zut, il me semblait que l'achat n'était pas nécessairesaire ...