The official Kuroko no Basket has released a trailer for anime called Winter Cup Soushuu-hen: Kage to Hikari, which is scheduled to premiere on September 3rd.
This will be the first of the trilogy; the second film will be called Winter Cup Soushuu-hen: Namida no Saki, premiering on October 8th, and the third, Winter Cup Soushuu-hen: Tobira no Mukou, premiering on December 3rd.
The spinoff series, Kuroko no Basket: Extra Game, is currently being adapted into a film, scheduled for release in 2017.
Check out the trailer:
Source: Nijimen