There is still no definite 'Winds of Winter' release date, but according to analysts, it will likely be released in 2017. That is, if author George R.R. Martin has the same writing pace as JK Rowling (author of Harry Potter), according to a geometry graph on Washington Post.

Five Thirty Eight website said it will release this August if Martin writes at 350 words daily. It will be done in February next year if he writes at 300 words a day; or October in case his daily writing average is only 250 words.

Five Thirty Eight calls their method of calculating the next 'A Song of Ice and Fire' book's release date "Martinology." The blog has received its reputation for statistical analysis and predictions on politics and baseball.

Five Thirty Eight makes use of the following George R.R. Martin's works for analysis:

- A Dance of Dragons – 422,000 words

- A Feast for Crows – 300,000 words

- A Storm of Swords – 424,000 words

- Clash of Kings – 326,000 words

- Game of Thrones - 298,000 words

- Winds of Winter – 1,500 pages (estimate)

The only fact known about Winds of Winter is it has been 400 pages done, as of October 2012, when the author told a reporter what he had finished.

After that, there was no news on his progress. Martin is known to be a slow writer but Washington Post claims the author does not deserve such reputation.

Martin might be taking some time, but his output is still on pace with Rowling's. Additionally, his works are higher in quality than those of other authors of fantasy stories.

However, the statistical predictions do not assure a definite release date for Martin's book, and though they are good tries, they can end up signifying nothing.

As to when the book finish, no one knows. The Winds of Winter release date will be whenever its author pleases.