While there is no official announcement yet from author George R.R. Martin regarding the release date of his upcoming book, "The Winds of Winter," there are speculations that it could come in 2017.

Fans were disappointed when Martin revealed on a post that the book is not yet finished, breaking his promise to launch the last installment of the book series, "Song of Ice and Fire" before or even during the run of the hit TV series, "Game of Thrones." The show is about to return with its premiere expected to air on April 4.

"You're disappointed, and you're not alone. My editors and publishers are disappointed, HBO is disappointed, my agents and foreign publishers and translators are disappointed... but no one could possibly be more disappointed than me," the critically acclaimed author admitted.

"For months now I have wanted nothing so much as to be able to say, 'I have completed and delivered "THE WINDS OF WINTER"' on or before the last day of 2015. But the book's not done," he further wrote.

After a lengthy explanation of his failure to deliver the manuscript on the deadline he and his publishers agreed on, which was before the end of October, Martin went on to say, "I am going back to my stance from last March, before all this. It will be done when it's done. And it will be as good as I can possibly make it."

In much more current news, the famous fiction author revealed in an interview with IGN that his avid readers will expect plot twist and turns on the upcoming novel. However, since this will involve some characters that "Game of Thrones" had already killed off, the show will not be able to incorporate it on its own storyline.

There are a lot of characters that had already died on "Game of Thrones," and Martin told IGN that 15 of those are not yet dead in the book series.

Martin had been teasing about the big twist since last year but he was not sure yet whether or not to go for it — until now.

"The Winds of Winter" is the sixth novel in the epic fantasy series "A Song of Ice and Fire," in which the "Game of Thrones" TV series is based on.