To be released on August 21, 2015. Not sure whether the SACD version will be released elsewhere, but the below Facebook posting mentioned Hong Kong will be the first market to get the SACD. The SACD will be pressed in Japan.
yesasia.com and hifi-cd.com both have the SACD up for pre-order:
http://www.yesasia.com/us/wallflower-sacd-香港版/1044943600-0-0-0-en/info.html
http://www.hifi-cd.com/en/product/item/25607/product_detail.html
yesasia.com and hifi-cd.com both have the SACD up for pre-order:
http://www.yesasia.com/us/wallflower-sacd-香港版/1044943600-0-0-0-en/info.html
http://www.hifi-cd.com/en/product/item/25607/product_detail.html