We don’t know any other info at the moment. It’s sold on Amazon Japan for ¥860.
BABYMETAL had appeared in this magazine’s April 2014 issue, you may have seen them before:
This is essentially a "merch festival", there will be merch stands with merchandise from several artists.
It includes a show report for the last 5 shows, as well as the "top 5 moments" from the "10 BABYMETAL BUDOKAN" shows.