Both the premier and the full title of the first film of the Fate / stay night: Heaven's Feel trilogy were revealed in AnimeJapan 2017 last Sunday. The title will be Fate / stay night: Heaven's Feel I. presage flower, while the premiere will take place on October 14 in Japan. 

"Heaven's Feel" is a route from the original Fate / stay Night visual novel, which got a manga adaptation. The manga launched in May 2015. The story of the film trilogy will focus on Sakura Matō, who from an early age, was adopted from Matō household.

Tomonori Sudou (Fate/stay night: Unlimited Blade Works, Fate/Zero) is in charge of the direction of the films, while the production was taken by the ufotable studio. Yuki Kajiura is composing the music and Takahiro Miura is providing the storyboards.

Source: animenewsnetwork.com