In his Facebook, George R. Martin once again reminded that initially the HBO plans were at once five missions "Games of Thrones", and, while the fate of four remains unknown, with one HBO has already decided. Brian Kogman's "Game of Thrones" preques the production of the first "Games" - "veteran" of the HBO show, which first worked as an assistant showranner, and then a screenwriter, editor and finally producer.
Martin calls Cogman "the main sign of the canon" and notes that it was Brian who participated in the process of writing the majority of the episodes of the "Games of the Thrones" - so and with the work on the feature will cope with "excellent."
Of course, to disclose any details about the plot of prequel, over which Kogman works, George R. Martin did not. The only thing that the writer stressed is that the project will not be a direct sequel "Games of the Thrones" and even the concept of "Spin-off" is not too suited for him, it is best to consider the coming series "successor" or "Prince" the original "Game of Thrones " Approximately, according to Martin, a new project will be broadcast in 2019/2020.