I haven't seen the anime myself, so I don't know what the music's like. I'll try to check it out sometime.
As for COALTAR OF THE DEEPERS news... Not that much. :\
Their last live was in May and they haven't mentioned anything about Rabbit EP yet...
However, non-Japanese fans can purchase COTD goods!
It works best if you have PayPal.
E-mail Kurata: firstname.lastname@example.org
Tell him what and how many you want to purchase and provide your PayPal e-mail address and address.
I was able to purchase some goods- it was a bit pricey but I think it was worth it. :)