One book he seem to have commissioned is:
The Emperor's Blade by Brian Staveley
Marco retweeted a Tweet by the author announcing the book, so I searched a bit on the author's Facebook and found this (the title in the post was only the working title):
October 1, 2012
It's official! Publisher's Marketplace has announced my book deal:
Brian Staveley's THE ASH AND THE EMBER, pitched as an epic fantasy in the vein of Game of Thrones, about two sons of the emperor -- one in brutal military training and one studying secret magic -- who must uncover the ancient conspiracy behind their father's murder, to Marco Palmieri at Tor, in a three-book deal, by Hannah Bowman at Liza Dawson Associates.
UK rights to Bella Pagan at Tor UK.