“Game of Thrones” author George R. R. Martin provided yet another hint on the release date of his highly-anticipated “Winds of Winter” book.

Christian Post cited the recent cameo appearance of Martin on Syfy channel’s “Z Nation,” in which the author was seen signing autograph for the copies of a book titled “A Promise of Spring.”

Martin appeared in the series’ Halloween episode, titled “The Collector,” as a zombified version of himself. The author was seen inside a “celebrity zombie room” and being presented to a collector, who seemed to be unfamiliar with Martin. The collector was told by GRRM’s captor that the author wrote “A Song of Ice and Fire,” Christian Post wrote.

Fans immediately speculated that Martin must be sending out a message through the title of the book and that he will be releasing “Winds of Winter” very soon, perhaps on Spring 2016.

Other speculations indicated that “Winds of Winter” may already be in the publishing house and may probably release in early 2016.

Martin also had earlier teased some “shocking twist” that the fans could expect in “Winds of Winter.”

In an interview with Entertainment Weekly in April, GRRM said he just came up with a big, revealing twist on a long-time character that he never previously considered.

“This is going to drive your readers crazy, but I love it. I’m still weighing whether to go that direction or not. It’s a great twist,” he teased.

Fans speculated that the twist may have been something to do with Jon Snow since the author had hinted in the past that Snow may be alive in the book.

Huffington Post noted that in 2011 when Martin was asked about Jon’s death in the future “A Song of Ice and Fire” books, the author said: “Oh you think he’s dead, do you?” When he was asked again about Jon recently, Martin responded: “If there’s one thing we know in ‘A Song of Ice and Fire’ is that death is not necessarily permanent,” Huffington Post wrote citing EW recent interview.

Snow, played by Kit Harington, seemed to die in the finale of “Game of Thrones” season five after being stabbed to death by the Night’s Watch.

However, several reports have emerged that proved otherwise.

It was reported that a scene was rehearsed involving Jon Snow, Sansa Stark (Sophie Turner), Ramsay Bolton (Iwan Rheon), and Littlefinger (Aidan Gillen). Watchers on the Wall sources uncovered that the scene is taking place in Winterfell.

Photos of Harington in Jon Snow costume were also shared online. The actor has been spotted filming GoT scenes in a remote hillside outside Belfast, Ireland recently.