@ALfromHELLSING The package itself can hold up to 8 discs. Kuraki Mai's single collection had 6 discs and used the same format:
https://www.youtube.com/watch?v=KX5Y5DL-GzE It's basically the same thing, you can see by the holes to pick the discs out.
To be honest when I see people saying, at least in Brazil, that a singer is doing a concert and recording the footage, we usually say that "he/she's doing a DVD". We rarely see a release in blu-ray of live concerts here.
I'm fine with having the regular release in blu-ray, at least they are not ditching the format. It's kinda funny how the country who started it all with HDTV and everything didn't really embrace the technology of home media in fullHD.