[LacusClyne]

it's been postpone, as requested by Avex Japan. Taiwan has already confirm that their side is ready to release the book and is now waiting for Japan's side approval.

Someone at Ayuchina had received a reply from taiwan that this is because Japan is planning to release japan/english/chinese version on the same day. Thus, the date is still not confirm.
you can refer to the thread.
http://www.ahsforum.com/forum/showthread.php?t=90306