It has been brought to our attention by @Hayabusa that after unlocking one of three themes that are supposed to be free in the just released 'Kingdom Hearts 2.8 HD Final Chapter Prologue', you will be charged $2.99 to download the theme rather than being able to download it for free:

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To make things even more confusing, KHInsider stated:

Most likely, this appears to be an error that'll hopefully be resolved soon. In the meantime, we'll be waiting for a response from Square-Enix.

EDIT: A GameFaqs user appears to have contacted Square-Enix regarding this issue, stating the following:

EDIT 2: The same user, domnu, also posted a screenshot of the email.

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We'll let you know if we hear anything else about this story. Thanks to @Hayabusa for letting us know!

EDIT 3:

According to Churro, a long time figure in the KH community, it seems like the themes are now free. As soon as we hear anything else (or if anyone in NA wants to give us a screenshot of this), we'll update this story more!