The official Twitter account of ufotable’s general director has announced that the final episode of their Fate/stay night: Unlimited Blade Works anime adaptation will air on December 27 as a spectacular 1 hour special.
— 近藤光（ufotable） (@hikaruufo) December 12, 2014
The final episode of the series is episode 12 although it is the 13th episode broadcasted, including episode 0. A 1 hour special will be aired on the 27th, much like episode 0 and episode 1 of the anime being 1 hour long. A small preview image of an early production of the episode was also released online:
Fate/stay night is a visual novel released by Type-Moon for the PC in 2004, and is the first in their Fate series. The visual novel was very successful and claimed the title of highest selling visual novel in that year. 2006 saw two adaptations of the game, a manga by Datto Nishiwaki and an anime series by Studio Deen. Additionally in that year, a light novel series titled Fate/Zero was written by Gen Urobuchi. It is a prequel to the visual novels, set 10 years prior. An anime and manga adaptation of Fate/Zero were created, with the manga written by Urobuchi himself in 2011 and the anime being animated by ufotable. A second season of Fate/Zero was also produced. uftoable earlier announced that they would be producing a new Fate/stay night anime and a Fate/stay night film based on the Heaven’s Feel Route.
Here is a synopsis of the series from MAL:
Raised by a mysterious sorcerer after the horrific death of his parents, Shiro Emiya has only just begun to help others using the small tidbits of magic that he’s learned. However, when he’s suddenly caught in a battle between two more powerful Magus, Shiro finds himself performing a spell above his expected ability, summoning the beautiful spirit warrior Saber to protect him! But safety is only momentary as Shiro and Saber now find themselves thrust into in a secret world of dark magic and deadly challenges: a no-holds barred duel to the death known as the Holy Grail War! At stake: a prize of unimaginable power. But can the inexperienced Shiro and Saber survive long enough to even enter the contest? First they’ll have to withstand waves of treachery and assassination, even as Shiro scrambles to learn everything he’ll need to know to stay alive as seven teams of Magus and Spirit Servants face off in mortal combat!
The final episode of Fate/stay night: Unlimited Blade Works will be airing on the saturday of December 27 at 12:00am, finishing the anime’s first cour. The second half of the anime will air next April, during the Spring 2015 season.
Source Article – @hikaruufo
“Fate/stay night”, “Fate/stay night Unlimited Blade Works,”, images, and all associated brands and titles © 2014 Type-Moon, ufotable and Fate/stay night Production Committee