There is no official story details yet but all we can guess is it will be awesome, Film does feature the voice cast from Ghost In The Shell: Arise, which consists of Maaya Sakamoto, Ikkyuu Juku, Kenichirou Matsuda, Tarusuke Shingaki, Shunsuke Sakuya, Takurou Nakakuni, Youji Ueda, Kazuya Nakai, and Miyuki Sawashiro.
Kazuchika Kise (Ghost in the Shell Arise chief director) will serve as chief director at Project I.G., and will also design the characters. Tow Ubukata (Ghost in the Shell Arise screenplay) will handle the screenplay, and Cornelius will score the film’s music. Kazuya Nomura (Robotics; Notes,Sengoku Basara – Samurai Kings: The Movie director) will serve as director, and Tooru Ookubo (Ghost in the Shell 2: Innocence, Ghost in the Shell: Stand Alone Complex key animation) will take the position of chief animation director.
The trailer is in Japanese, but here is a translation of what is said thank to Anime News Network:
Text: The legendary science-fiction work that caused a revolution around the world.
Text: Original Work – Masamune Shirow
Text: A work in celebration of 25 years
Text: The awakened ghost whispers…
Text: Ghost in the Shell: The New Movie
Text: Opens in early summer 2015