Last week, HBO confirmed that it is moving forward with one of the five Game of Thrones spin-offs, which was written by Jane Goldman (Kingsman movies) based on a story Goldman co-created with Game of Thrones author George R.R. Martin. Now the author had addressed this official pick-up on his official blog, clarifying that HBO has only issued a pilot order, not a full series order yet. He also revealed that one of the other four spin-offs is now dead, but the other three are still in contention for pilot orders. Here's an excerpt from his blog below, where he confirmed that the show which was given a pilot order still doesn't have a title yet.

"I will try to keep you all informed as work progresses on the new show (whatever we end up calling it)... though, given the amount of stuff I am trying to juggle right now, news will probably break on a dozen other places before I get around to it, as happened here. As for the other successor shows... if you have been following along, you know that we started with four, and eventually went to five. One of those has been shelved, I am given to understand, and of course Jane's pilot is now moving to film. But that does not mean the others are dead. Three more Game of Thrones prequels, set in different periods and featuring different characters and storylines, remain in active development. Everything I am told indicates that we could film at least one more pilot, and maybe more than one, in the years to come. We do have an entire world and tens of thousands of years of history to play with, after all. But this is television, so nothing is certain."
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While no plot details were given for any of the other shows, George R.R. Martin was working on all of them with different writers. The other writers were Max Borenstein (Kong: Skull Island), Brian Helgeland (L.A. Confidential) Carly Wray (Mad Men) and longtime Game of Thrones writer Bryan Cogman, though Martin wouldn't confirm which of these remaining shows was taken out of consideration. Martin also confirmed that Jane Goldman will not only write the pilot script, but she will serve as showrunner, although a director for the pilot episode has not yet been chosen. Here's another excerpt from Martin's blog, where he confirms again that this is a prequel to Game of Thrones, while expressing how talented Jane Goldman is and that she should be deserving more credit than she is, while offering a hint at what he'd like the title for this new show to be.

"Yes, this is a prequel, not a sequel. None of the characters or actors from Game of Thrones will appear in the new show. All of the successor shows we've been developing have been prequels, as I have mentioned before. This one really puts the PRE in prequel, since it is set not ninety years before Game of Thrones (like Dunk & Egg), or a few hundred years, but rather ten thousand years (well, assuming the oral histories of the First Men are accurate, but there are maesters at the Citadel who insist it has only been half that long). We're very early in the process, of course, with the pilot order just in, so we don't have a director yet, or a cast, or a location, or even a title. (My vote would be The Long Night, which says it all, but I'd be surprised if that's where we end up. More likely HBO will want to work the phrase "game of thrones" in there somewhere. We'll know sooner or later). All of the news stories about the pilot being greenlit are slapping my own picture up there next to Jane's, which is very flattering but also a little misleading Remember, they also slapped my picture up on the news stories about the TV development of Nnedi Okarafor's Who Fears Death, when they should have been using Nnedi's picture. I've consulted with all of the writers on all of the successor shows, and several of them have visited me in Santa Fe for long days of discussion, and we've gone back and forth in email, text, and telephone, so I have definitely been involved... but really, the accolades here should go to Jane. She has been an absolute thrill to work with... and my god, what a talent."

With the final season of Game of Thrones arriving sometime next year, it was also confirmed that the first of these spin-offs won't arrive until at least 2020. It's possible that the pilot episode for this untitled series won't even start filming until sometime next year, although there hasn't been a confirmed production schedule in place yet. You can head over to George R.R. Martin's Not a Blog for the full blog post.