The Seven Deadly Sins returns with a new film and the official website for the anime revealed new information such as title, a new teaser video, new visual and release date. The title of the film will be Gekijōban Nanatsu no Taizai Tenkū no Torawarebito (The Seven Deadly Sins the Movie: Prisoners of the Sky) and will feature a whole new story by the manga creator, Nakaba Suzuki. The new anime movie will premiere on August 18. 

You can watch the teaser video here: https://twitter.com/twitter/statuses/964154218184519685

The new visual of the film: 

The story has as follows:

A little time has passed since The Seven Deadly Sins and Princess Elizabeth brought peace to the kingdom. To celebrate the king's birthday, The Seven Deadly Sins travel to a remote land in search of the phantom ingredient "sky fish." Meliodas and Hawk end up at a "Sky Palace" that exists above the clouds, where all the residents have wings. Meliodas is mistaken for a boy who committed a crime and is thrown in prison. Meanwhile, the residents are preparing a ceremony for defense against a ferocious beast that awakens once every 3,000 years. But the Six Knights of Black, a Demon Clan army, arrives and removes the seal on the beast in order to threaten the lives of the residents of Sky Palace. Meliodas and his allies meet the Six Knights of Black in battle.

The cast returns with:

Yuuki Kaji as Meliodas

Sora Amamiya as Elizabeth

Misaki Kuno as Hawk

Aoi Yūki as Diane

Tatsuhisa Suzuki as Ban

Jun Fukuyama as King

Yuuhei Takagi as Gowther

Maaya Sakamoto as Merlin

Tomokazu Sugita as Escanor

Noriyuki Abe is the chief director, while Yasuto Nishikata is directing the film at A-1 Pictures. Makoto Uezu is charge of the script, while Keigo Sasaki returns to the character design and performs as animation director. Hiroyuki Sawano is composing the music.

Nakaba Suzuki launched the manga in Weekly Shōnen Magazine in 2012. The first 24-episode television series was released in 2014 and completed in 2015. In August 2016, a special four-episode television anime titled The Seven Deadly Sins - Signs of Holy War- premiered, while the second season titled The Seven Deadly Sins: Revival of The Commandments was released in January. Several spinoff manga, novels, OVAs and games have been based on its story.

Source: animenewsnetwork.com