The official US and EU sites have published another developer diary for Book 12! Check it out!:

Battle for control of a new PvMP dungeon: the Delving of Frór, or return to Angmar and check out its nearly complete overhaul for playability and fun. Join us as we unveil the next book in this epic adventure, Book 12: The Ashen Wastes!

To read the entire story click here, or here for the EU website.