Last month, it was confirmed that HBO is developing four Game of Thrones spin-offs, with author George R.R. Martin later revealing that there was a fifth series in the works as well. The author recently took to his official blog to reveal that all five of these shows are still moving forward, although it's too early to tell at this point in the development process which shows will actually get series orders, and which will fall by the wayside. Here's what the author and producer had to say about these "successor shows" for Game of Thrones.

"Season 7 of Game of Thrones will be here on July 16 (and we're doing a season 6 marathon at the JCC), the five successor shows are moving forward at various rates of speed and there are a couple other TV projects that I can't tell you about... how much of this will come to pass, nobody knows. Ah, the joys of development."

The author revealed this update during a post on his George R.R. Martin LiveJournal. While no specifics have been revealed at this time, it has been confirmed that all of these shows will be Game of Thrones prequels. George R.R. Martin also revealed last month that none of these shows will follow the Dunk & Egg stories, which the writer had previously teased could be adapted for a new Game of Thrones series. He added that he has only written three of the Dunk & Egg novellas, which are set 100 years before the events of the Game of Thrones books and TV series, and he wants to write "at least seven or eight or ten" more of those books. He also stated that he doesn't want to repeat what happened with Game of Thrones, where the show caught up to the books, so Dunk & Egg fans may have to wait quite some time before those stories come to the small screen.

The author also confirmed that another story which won't be explored by these spin-offs is Robert Baratheon's rebellion, which fans have even petitioned to be explored further. The Game of Thrones author stated that, by the time he finishes writing his A Song of Fire and Ice novels, fans will know everything there is to know about Robert Baratheon's rebellion. With the seventh season debuting in just a few weeks on Sunday, July 16, spanning seven episodes, and the six-episode final season arriving in either 2018 or possibly 2019, it's possible we may know which of these spin-offs will be moving forward before the flagship series comes to an end.

HBO has brought in writers Max Borenstein (Godzilla, Kong: Skull Island), Jane Goldman (Kick-Ass, Kingsman: The Golden Circle), Brian Helgeland (Mystic River, L.A. Confidential) and Carly Wray (Mad Man) to work with George R.R. Martin, who was originally rumored to only be working with two of these writers, although he later confirmed that he is working with all of them. As for the fifth show, it hasn't been revealed which writer is working on that project, or if there is a new writer coming aboard for that show. Hopefully we'll find out more about Game of Thrones and these prequel spin-offs sooner rather than later.