If you preorder Kingdom Hearts 3D: Dream Drop Distance, you will receive three AR cards that unlock rare Dream Eaters. Since KH3DS has an AR feature, this preorder incentive is, in a roundabout way, additional game content.
From the press release, the included cards will provide the following:
- one card unlocks one of three rare Dream Eaters: Ursa Circus, Sudo Neko, or Meowjesty;
- one card unlocks the R&R Seal Dream Eater; and
- one card serves as a 3600 viewing stand.
The last one really, really confuses me, but I guess it will all make sense come July. Then again, it is Kingdom Hearts, so...maybe not.