[truehappiness]

It's a card that can replace the actual cover and probably has the "You were... / BALLAD" or "BALLAD / You were..." text on it. Ayu hasn't really had these extras before IIRC, but in other examples [like for K-ON!'s OP single], they're just an alternate photo which is why most think that a set of poses with her in that feathery fairy outfit will be the shots used for the cover cards. Unless for some reason it's just a card with the cover printed on it again [highly unlikely] or has Ayu looking in some other direction with her head turned slightly [also unlikely imo, but still possible] so... hm. It doesn't seem like this sort of first press extra is all that common in the industry anyway.

This all makes me wonder if she's going to go for the CD+DVD slim cases this time around since the CD+DVD cases she uses nowadays don't allow you to switch jacket photos without popping the case open. Most buyers of J-Pop CDs in general seem to buy CD+DVD versions if they're available, and Ayu's tend to be fat with the cover [in thin card form] stuck in the front so it's not as though one can just stick another booklet in front unless you cut a page out.