Game of Thrones fans have just a few more months to wait until Season 5 of the hit series debuts in April, but for those who are clamoring for author George R.R. Martin's sixth book in his A Song of Fire and Ice series, we still have no clue when that book may debut. We reported earlier this week that the author has no plans to publish the next book, entitled The Winds of Winter in 2015, which means that the HBO series will likely end before the last two books are even published.

As you may know, George R.R. Martin originally envisioned Game of Thrones as a trilogy, and today we have a leaked 1993 letter from the author to his publisher, which Waterhouse Books originally posted on their Twitter page before deleting the images shortly thereafter. Tumblr user Bryndenbfish re-posted the photos of this three-page letter, which outlines George R.R. Martin's original plans for his then-trilogy, which was later expanded to a seven-book series, five of which have been completed. If you aren't caught up with the show or the books, there will be SPOILERS below, so read on at your own risk.

In the letter, the author reveals that he wanted only five central characters to survive in his book trilogy, Tyrion Lannister (Peter Dinklage), Daenerys Targaryen (Emilia Clarke), Jon Snow (Kit Harington) Arya Stark (Maisie Williams) and Bran Stark (Isaac Hempstead-Wright). Of course, all of these characters are still alive in the books and in the TV series, but there are several intriguing details from this letter that were changed in the TV series. For one, both Arya Stark and Bran Stark were supposed to flee North with their mother Catelyn (Michelle Fairley) after Eddard Stark (Sean Bean) was killed by Joffrey (Jack Gleeson). Robb Stark (Richard Madden) was supposed to kill Joffrey to avenge his father's death, before he was killed by the Lannisters in battle.

RELATED: Game of Thrones Creators Sign Huge Netflix Deal to Create New Movies & TV Shows

Another intriguing element of this early plot rundown is that Arya and her half-brother Jon Snow were supposed to fall in love, although neither one would act on their urges. Also, later in the series, Tyrion was also supposed to fall for Arya, instead of Sansa (Sophie Turner) when he joins the Stark's side after being hunted by his brother. Instead of Joffrey being killed during the Purple Wedding, he actually marries Sansa, who betrays her family and gives him a child and heir to the Iron Throne, although Sansa eventually regrets this decision. Finally, in this early version, Daenerys actually becomes upset that her husband Khal Drogo (Jason Momoa) kills her brother Viserys (Harry Lloyd), and it is Daenerys that kills Khal out of revenge for her brother, before she begins her quest to rule the Seven Kingdoms.

It should be noted that this letter was written three years before the first Game of Thrones book was published in 1996, and as you can tell, quite a lot has changed. What do you think about these details? Would you rather see Joffrey still alive with an heir to the throne? Would you have rather seen Arya and Bran flee north with her mother instead of going in different directions? Let us know what you think below, and you can check out the images of this three-page letter at Bryndenbfish's Tumblr page.