Expected September 12th.
You can order here (remember to get the 327). Removed due to overwhelming demand. Here is the official link to buy. At the time of writing, they don’t have it listed yet… You could also buy it here.
Metal Hammer has now confirmed, it’s the cover. 8 page article with pictures. Here is an article with a few quotes.
Comes with a BABYMETAL art print and a patch (woven).