CDL07-08's extra footage information has been posted on the official site.
It's a "making movie" that is about 30 minutes long. Please, not another documentary. But bloopers would be fine.
tbh, the cover isn't good, but it isn't bad. It's just average. At least Ayu's on it. My impression is that they should've probably chosen a more intense shot and had it cover the whole front instead of cut it out using the logo..