The film is known as Gekijōban Fate/kaleid liner Prisma Illya: Sekka no Chikai aka Movie Version Fate/kaleid liner Prisma ☆ Illya: Oath Under the Snow and now a two-minute trailer for it has arrived that shows off a lot of big scenes and the theme song from it.
We learned last fall at the end of the fourth season of Fate/kaleid liner Prisma Illya 3rei!!
The series began in 2007 and has run several short-run series with each working its own progression and theme while tied to the larger work.
that a theatrical film is in production for the franchise and it was recently set for an August 26th, 2017 debut.