gnd are doing two promotional things related to people who purchased the best album.
The first is the chance for the members of gnd to come to your house with a signed poster (mu-mo buyers only, 5 people total. The first winner was posted on Chisa's blog), and the second is to win pieces of clothing Chisa wore in jacket covers or music videos (10 winners, you have to send in verification of your purchased copy to Avex, and there are some pictures on their official site in the News section).
To be honest, that -actually- caused me to consider buying a copy.
Oh, I forgot to say this. The cover itself is just the yellow/pink picture. The sleeve case is clear with the title and the single's jacket history printed on it. Once you take the sleeve off it's just the good picture.
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"Remember, don't let others dictate your music taste. If you like whatever you're listening to, keep listening to it."