According to this site The Hanako to Anne drama’s OST composed by Yuki Kajiura will come out in June 18, 2014!
Title: Hanako to Anne Original Soundtrack
Product Code: SECL-1514
Release Date: June 18, 2014
Price: 3146yen (Tax incl.)
[Pre-order] from CD Japan
Thanks to random for the news!
We will update with the official announcement when it comes out 🙂
Check out here for a PV of the show featuring BGM by Yuki Kajiura ! 😀
thank to Kowz
[EDIT: 1/4/2014] Check out the first episode of the drama 🙂 The soundtrack looks promising, featuring uilleann pipes, accordion, acoustic guitar and (real) harp among other instruments 😀