From the email:.. sometime early next year. Release date wasn’t announced.
The long-awaited release will be a 4 disc set with disc 1 containing cues from The Magician's Apprentice, The Witch's Familiar, Under The Lake, Before The Flood, The Girl Who Died and The Woman Who Lived; and disc 2 containing cues from The Zygon Invasion, The Zygon Inversion, Sleep No More, Face The Raven and Hell Bent.
Disc 3 will contain the score from the Series standout episode - Heaven Sent
Disc 4 will contain the score to the 2015 Christmas Special - The Husbands Of River Song
I have concentrated on the Xmas specials. I recommend 'A Christmas Carol'- it plays as a kind of Best-Of of the Matt Smith years, along with a new Doctor Who Theme and and an original song sung by Katherine Jenkins.